Mechanical and transport properties of fibrous amorphous silica meshes and membranes fabricated from compressed electrospun precursor fibers
Publication date: 1 December 2019Source: Journal of Non-Crystalline Solids, Volume 525Author(s): Andrei Stanishevsky, Justin TchernovAbstractHighly porous, 0.1–1.5 mm thick fibrous amorphous silica (FAS) meshes with 500 ± 200 nm fiber diameters were prepared from the precursor fibers made by a high-yield free-surface alternating field electrospinning (AFES) process. A combination of mild thermal and pressure treatment of the fibrous precursor material before the calcination step was used to tailor the mechanical and transport properties of the resulting FAS structures. Compression of the as-spun materi...
Source: Journal of Non Crystalline Solids - September 13, 2019 Category: Chemistry Source Type: research

Enhanced ~1.8 μm photoluminescence under blue light excitation in TmBi co-doped germanate glass and its temperature dependence
Publication date: 1 December 2019Source: Journal of Non-Crystalline Solids, Volume 525Author(s): Chengzhen Liu, Yixi Zhuang, Jianjun Han, Jian Ruan, Xiujian Zhao, Taras KavetskyyAbstractTm-doped, Bi-doped, and TmBi co-doped barium aluminogermanate glasses were prepared and their optical properties, quantum yield and photoluminescence thermal quenching were studied under 460 nm excitation. A significant enhanced emission at ~1.8 μm is revealed in the TmBi co-doped glass, which was ~14 times stronger than that in the Tm-doped glass. Efficient energy transfer from Bi-related active center to Tm3+ ions with efficiency o...
Source: Journal of Non Crystalline Solids - September 13, 2019 Category: Chemistry Source Type: research

Relaxation of the free energy landscape and temperature modulation spectroscopy
Publication date: Available online 11 September 2019Source: Journal of Non-Crystalline SolidsAuthor(s): T. Odagaki, Y. Saruyama, T. IshidaAbstractThe free energy landscape (FEL) depends on temperature by its definition and the FEL is reorganized with time delay when the temperature is modulated. We investigate how the relaxation of the FEL manifests itself in physical properties. Exploiting a simple two-level model for the dielectric relaxation, we first show that the relaxation of the FEL produces time dependence of the relaxation time of the dielectric response. Then we discuss the relaxation of dielectric susceptibility...
Source: Journal of Non Crystalline Solids - September 13, 2019 Category: Chemistry Source Type: research

Molecular dynamic in binary mixtures and polymer blends with large difference in glass transition temperatures of the two components: A critical review
Publication date: Available online 11 September 2019Source: Journal of Non-Crystalline SolidsAuthor(s): K.L. Ngai, Sofia Valenti, S. CapaccioliAbstractThe dynamics in highly asymmetric mixtures with large difference in Tg of the two components are complex. At low values of the lower-Tg2 component only the α1-relaxation and its Tgα1 were found together with a fast relaxation. Three different interpretations of the fast relaxation were given. The first one interpreted the fast relaxation as the JG β-relaxation, and the α2-relaxation is present but not resolved. The second one interpreted it as localize...
Source: Journal of Non Crystalline Solids - September 13, 2019 Category: Chemistry Source Type: research

Editorial Board
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): (Source: Journal of Non Crystalline Solids)
Source: Journal of Non Crystalline Solids - September 13, 2019 Category: Chemistry Source Type: research

Viscosity of melts in the NaAlSiO4-KAlSiO4-SiO2 system: Configurational entropy modelling
We present a configurational entropy model for the viscosity of melts in the system as a function of Na/(Na + K) and Al/(Al + Si) ratios. Our modelling indicates that: i) Viscosity data are reproduced well by a non-ideal, symmetrical form of the parameters Sconf(Tg) and Be, ii) Na-K mixing is the main source of additional entropy in the system based on the limited dependence of Sconf(Tg) and Be parameters on Al/(Al + Si) ratio, iii) Ae likely varies as a function of Al/(Al + Si) ratio. Melt fragility in the system increases with increasing Al/(Al + Si) ratio and is greater for Na or K end-member melts t...
Source: Journal of Non Crystalline Solids - September 13, 2019 Category: Chemistry Source Type: research

Effect of Tb3+/Yb3+ in the nonlinear refractive spectrum of CaLiBO glasses
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): S.N.C. Santos, K.T. Paula, J.M.P. Almeida, A.C. Hernandes, C.R. MendonçaAbstractThis paper reports a study on linear and nonlinear optical properties in a series of lithium‑calcium tetraborate (CaLiBO) glasses in the presence of two rare earth ions, Tb3+ and Yb3+. The nonlinear index of refraction (n2) was determined in a wide wavelength range (470–1500 nm) through femtosecond Z-scan technique. Such results were modeled by BGO approach, in which the optical nonlinearity was related to the oxygens present in th...
Source: Journal of Non Crystalline Solids - September 13, 2019 Category: Chemistry Source Type: research

sp2 amorphous carbons in view of multianalytical consideration: Normal, expeсted and new
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): Yevgeny A. Golubev, Natalia N. Rozhkova, Evgeniy N. Kabachkov, Yuri M. Shul'ga, Krystyna Natkaniec-Hołderna, Ireneusz Natkaniec, Igor V. Antonets, Boris A. Makeev, Nadezhda A. Popova, Vera A. Popova, Elena F. ShekaAbstractsp2 Amorphous carbons are considered as objects of the modern nanotechnology. A particular set of the highest‑carbon-content sp2 species, two natural amorphous carbons (shungite carbon and antraxolite) as well as two engineered carbon blacks were subjected to analytical study by using a set of selected mod...
Source: Journal of Non Crystalline Solids - September 13, 2019 Category: Chemistry Source Type: research

Structure and low field magnetic properties in phosphate-tellurite glasses
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): Silviu PolosanAbstractPhosphate-tellurite glasses exhibit magnetic properties, due to the presence of the small metallic Te colloids which were revealed in low field magnetic circular dichroism. These metallic colloids induce the red coloring of these glasses together with the absorbance in the visible region. The temperature dependence of the absorption spectrum and the A-term in magnetic circular dichroism are specific for Te metallic nanoparticles, which results during the melting procedure over 10000C due to the conversion...
Source: Journal of Non Crystalline Solids - September 13, 2019 Category: Chemistry Source Type: research

Lanthanum modification of crystalline phases and residual glass in augite glass ceramics produced with industrial solid wastes
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): Hua Chen, Baowei Li, Ming Zhao, Xuefeng Zhang, Yongsheng Du, Yu Shi, John S. McCloyAbstractThe effects of La2O3 on microstructure and properties of the CaO-MgO-SiO2-Al2O3 glass ceramics, made from Bayan Obo West Mine tailing and fly ash, were investigated. Results showed that La2O3 additions up to 2 wt% promoted augite crystallization. Above this concentration, La2O3 suppressed augite crystallization by rather forming lanthanum oxyapatite that acted as a barrier for the growth of augite. Also Cr ions, the key element for the...
Source: Journal of Non Crystalline Solids - September 7, 2019 Category: Chemistry Source Type: research

Structural characterization of ZnSO4-K2SO4-NaCl glasses
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): Emily T. Nienhuis, Muad Saleh, José Marcial, Kyle Kriegsman, Jason Lonergan, Andrew S. Lipton, Xiaofeng Guo, John S. McCloyAbstractGlasses with compositions xNaCl-(50-x/2)K2SO4-(50-x/2)ZnSO4, x = 0 to 30 (in mol%), were characterized via vibrational spectroscopy and X-ray pair distribution function (xPDF) analysis. The xPDF's were modeled using Empirical Potential Structure Refinement (EPSR). From the modeled xPDF, the deconvoluted xPDFs were obtained along with cation-anion coordination numbers. The sulfate environ...
Source: Journal of Non Crystalline Solids - September 7, 2019 Category: Chemistry Source Type: research

Amorphous boron arsenide
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): Murat DurandurduAbstractThe short-range order and electrical properties of amorphous boron arsenide (BAs) are evaluated by means of ab initio molecular dynamics simulations. The amorphous model is obtained from the fast solidification of the BAs melt and consists of B-rich and As-rich domains. The average coordination number of B- and As-atoms are found as 4.97 and 3.34, respectively. B-atoms have a tendency to form pentagonal pyramidal-like configurations as commonly seen in boron or boron rich materials. Yet B12 molecules do...
Source: Journal of Non Crystalline Solids - September 7, 2019 Category: Chemistry Source Type: research

Response surface methodology application to fly ash based geopolymer synthesized by alkali fusion method
In this study, fly ash based geopolymer was synthesized by Alkali Fusion Method. The experimental set up was designed by Design Expert Trial 7 program and the optimum geopolymer synthesis conditions including additional Al2O3 ratio, curing temperature were determined by Central Composite Inscribed Design (CCI) Method. Also, ANOVA analysis and optimization were carried out. X-ray fluorescence spectrometer (XRF), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), Scanning electron microscope-Energy-dispersive X-ray (SEM-EDX) and Brunauer–Emmett–Teller (BET) analyzes were applied for the cha...
Source: Journal of Non Crystalline Solids - September 7, 2019 Category: Chemistry Source Type: research

Ternary Co-Mo-B bulk metallic glasses with ultrahigh strength and good ductility
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): Limin Lai, Rangan He, Kailu Ding, Tianhao Liu, Ruoyu Liu, Yanxia Chen, Shengfeng GuoAbstractIn this work, novel ternary Co100-x-yMoxBy (at.%, x = 18–28, y = 11–17) bulk metallic glasses (BMGs) with ultrahigh strength and good ductility were developed by copper mold casting technology. The best glass former of the marginal BMG chemical composition was Co64Mo22B14 with a maximum critical size up to 2 mm in diameter. It revealed that the compressive strength and plastic strain of Co-Mo-B ternary BMGs were 46...
Source: Journal of Non Crystalline Solids - September 7, 2019 Category: Chemistry Source Type: research

Why fumed and precipitated silica have different mechanical behavior: Contribution of discrete element simulations
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): E. Guesnet, B. Bénane, D. Jauffrès, C.L. Martin, G.P. Baeza, G. Foray, S. Meille, C. Olagnon, B. YrieixAbstractPrecipitated silica (PS) could be an interesting alternative to fumed silica (FS) for the core of Vacuum Insulation Panels (VIP), in particular to reduce their cost and widen their use. However, compacted PS exhibits, for the same density, lower mechanical properties than FS. A better understanding of the mechanical behavior of these materials would help to design PS with optimized mechanical properties ...
Source: Journal of Non Crystalline Solids - September 7, 2019 Category: Chemistry Source Type: research

Effects of cooling rate and oxygen partial pressure on heterogeneous crystal nucleation of supercooled lithium disilicate melt in PtRh20 containers
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): R. Al-Mukadam, J. DeubenerAbstractLithium disilicate melt in DSC containers made of platinum rhodium alloy PtRh20 is repetitively supercooled at two different oxygen partial pressures. Using 5 different cooling rates and 332 runs per cooling rate, kinetic data of heterogeneous crystal nucleation are determined with high statistical significance. Two different types of crystallizations are evident. A first at higher supercooling temperature exclusively consists of lithium disilicate crystals and a second at lower supercooling t...
Source: Journal of Non Crystalline Solids - September 5, 2019 Category: Chemistry Source Type: research

Non-alkali glass substrate with improved mechanical properties for display devices
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): Jianlei Liu, Lei Han, Zhiwei Luo, Qianxing Huang, Xi He, Changwei Lin, Taoyong Liu, Cui Li, Anxian LuAbstractTo improve the mechanical properties of non-alkali glass substrate for display devices, B2O3-Al2O3-SiO2-MgO-SrO-MgF2 glass system was chosen and crystallized in this work. The effect of different nucleation-crystallization processes on the structure and properties of the glass and glass-ceramics was systemically studied. The results show the glass-ceramics have better properties than the parent glass due to the precipit...
Source: Journal of Non Crystalline Solids - September 5, 2019 Category: Chemistry Source Type: research

Magneto-optical properties of cerium-doped phosphate glass
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): Aleksey Starobor, Oleg Palashov, Anastasiia Babkina, Ekaterina Kulpina, Yevgeniy Sgibnev, Yuriy Fedorov, Nikolay Nikonorov, Alexander Ignatiev, Ksenia Zyryanova, Kseniya OreshkinaAbstractPhosphate glass with a high transmission level in the visible and near-IR spectral regions doped with a high cerium concentration (up to 25 mol%) was synthesized and experimentally investigated in terms of applicability as a material for magneto-optical devices. Glass transition temperature was 590 °C. Glass refractive index varied bet...
Source: Journal of Non Crystalline Solids - September 5, 2019 Category: Chemistry Source Type: research

Predicting Young's modulus of oxide glasses with sparse datasets using machine learning
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): Suresh Bishnoi, Sourabh Singh, R. Ravinder, Mathieu Bauchy, Nitya Nand Gosvami, Hariprasad Kodamana, N.M. Anoop KrishnanAbstractMachine learning (ML) methods are becoming popular tools for predicting and designing novel materials. In particular, neural network (NN) is a promising ML method, which can be used to identify hidden trends in the data. However, these methods rely on a large dataset and often exhibit overfitting when used with a sparse dataset. Further, assessing the uncertainty in predictions for a new dataset or an...
Source: Journal of Non Crystalline Solids - September 5, 2019 Category: Chemistry Source Type: research

Fifty years of fragility: A view from the cheap seats
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): D.L. SidebottomAbstractRecent advances in understanding the origins of glass-forming fragility in terms of fundamental bonding structure in network-forming glasses (NFGs) includes a proposition that the fragility index is uniquely defined by a single mean field parameter, a coarse-grained variant of the average bond density, 〈nCG〉. This finding resonates with much earlier speculations, first voiced by Nemilov in an under-appreciated paper (Nemilov, 1966), that the fragility in oxide glasses is roughly correlated to the ave...
Source: Journal of Non Crystalline Solids - September 5, 2019 Category: Chemistry Source Type: research

Trap-controlled fractal diffusion model of the Havriliak-Negami dielectric relaxation
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): A.A. KhamzinAbstractA new model of non-Debye dielectric relaxation, which leads to the popular in broadband dielectric spectroscopy Havriliak-Negami expression for two-power-law dielectric response, is proposed. The new model is based on the multiple trapping model and the fractal diffusion model. Explicit analytical expressions for experimentally measured values such as dielectric strength, characteristic relaxation time, and power-law exponents, which include the microscopic parameters of the medium, are obtain. The comparis...
Source: Journal of Non Crystalline Solids - September 5, 2019 Category: Chemistry Source Type: research

An experimental case study on corrosion characterization of Cu46Zr40Ti8.5Al5.5 metallic glass
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): Adithya Nair, Yogesh Prabhu, Jasmitha Mendonca, W.H. Ryu, E.S. Park, Jatin Bhatt, S. VincentAbstractIn the present work, a novel Cu46Zr40Ti8.5Al5.5 metallic glass is synthesized by melt spun technique and investigated for corrosion behavior at various molar concentrations in acidic, neutral and alkaline solutions (at different pH levels), using potentiodynamic polarization experiment and electrochemical impedance spectroscopy (EIS). Surface morphology and composition analysis after corrosion test were carried out by scanning e...
Source: Journal of Non Crystalline Solids - September 5, 2019 Category: Chemistry Source Type: research

Physical, mechanical and gamma-ray shielding properties of highly transparent ZnO-MoO3-TeO2 glasses
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): M. Çelikbilek Ersundu, A.E. Ersundu, N. Gedikoğlu, E. Şakar, M. Büyükyıldız, M. KurudirekAbstractPhysical, mechanical and radiation shielding properties of ZnO-MoO3-TeO2 glasses were studied. Density, molar volume, oxygen molar volume, oxygen packing density were evaluated for the interpretation of physical properties. Mechanical properties were determined through Vickers hardness measurements. The shielding estimation was accomplished by studying linear attenuation coefficient (LACμ), mass attenuation ...
Source: Journal of Non Crystalline Solids - September 5, 2019 Category: Chemistry Source Type: research

A kinetic study approach for in-situ preparation of amorphous Ni based nanocomposite reinforced by nanocrystalline Ni-Ti shape memory alloy
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): Mohammad Hossein Khazaei Feizabad, Gholam Reza Khayati, Hossein MinoueiAbstractIn-situ preparation of nanocomposite including a shape memory alloy (Ni-Ti) as reinforcement in the Ni amorphous matrix is the subject of this content. Firstly, the amorphous alloy has been prepared using high-energy ball milling of pure elements, i.e., Ni, Nb, Ti and Si as alloying elements. Then, by the employment of kinetic modeling, the crystallization process (i.e., as a two-step phenomenon) of prepared amorphous alloy has been controlled in a ...
Source: Journal of Non Crystalline Solids - September 5, 2019 Category: Chemistry Source Type: research

Non-isothermal crystallization of TeO2-Na2O-TiO2 glasses
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): J.V. Gunha, A. Somer, A. Gonçalves, S. do R.F. Sabino, R. El-Mallawany, C. Jacinto, A. NovatskiAbstractGlass samples in the form 80TeO2-(20-x)Na2O-xTiO2 with x = 0, 5, 10, 15 and 20 mol%, were fabricated by the melting quenching technique. The thermal behavior of samples was analyzed considering their crystallization kinetics mechanism and microstructural analysis. Differential Scanning Calorimetry (DSC) was performed at 20 ml/min argon flux and heating rates of 10, 13, 15 and 20 K/min, from ambient temperatur...
Source: Journal of Non Crystalline Solids - September 5, 2019 Category: Chemistry Source Type: research

Relating Magnox and international waste glasses
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): Thomas L. Goût, Mike T. Harrison, Ian FarnanAbstractMagnox and international radioactive waste glasses observe significantly different aqueous dissolution behaviours. Previously, the effects of Li on the kinetics of dissolution and B network of analogues of a complex Magnox waste glass were investigated (Li-Mg-EM). Here, an “International Simple Glass” with Li substituted for Na at two ratios (Li-ISG) was fabricated to compare the aqueous durability of Magnox and international glasses. 11B MAS-NMR, 23Na MAS-N...
Source: Journal of Non Crystalline Solids - September 5, 2019 Category: Chemistry Source Type: research

Photoluminescence of Yb3+/Ce3+ co-doped aluminosilicate glasses under ultraviolet irradiation
Publication date: Available online 3 September 2019Source: Journal of Non-Crystalline SolidsAuthor(s): Wei Feng, Shengfei She, Pengfei Wang, Yongsheng Liu, Chang Chang, Chaoqi Hou, Weinan LiAbstractThe photoluminescence and decay properties of Yb3+/Ce3+ co-doped aluminosilicate glasses were investigated under ultraviolet irradiation. A strong excitation band was ascribed to 4f → 5d transitions of Ce3+ ions. A broad ultraviolet-visible emission band belonged to 5d → 4f transitions of Ce3+ ions and oxygen-deficient centers (ODCs) in the host matrix, and the visible-near infrared emission band was attributed...
Source: Journal of Non Crystalline Solids - September 4, 2019 Category: Chemistry Source Type: research

Phase-field simulation of spinodal phase separation in the Na2O-SiO2 glasses
Publication date: Available online 3 September 2019Source: Journal of Non-Crystalline SolidsAuthor(s): Sung S. Kim, T.H. SandersAbstractThe phase-field method was used for the kinetic simulation of the spinodal phase separation of glasses in the Na2O-SiO2 system. The miscibility gap and spinodal curve were calculated based on the previous interaction parameters of the liquid phase. The kinetic simulations showed that the resultant morphology depended on the initial concentration and the temperature. In the early stages of spinodal decomposition, the interconnected structure developed continuously and in the later stages be...
Source: Journal of Non Crystalline Solids - September 4, 2019 Category: Chemistry Source Type: research

Editorial Board
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): (Source: Journal of Non Crystalline Solids)
Source: Journal of Non Crystalline Solids - September 4, 2019 Category: Chemistry Source Type: research

Effect of lithium addition on Te4+ emission in TeO2-Li2O glasses
Publication date: 15 November 2019Source: Journal of Non-Crystalline Solids, Volume 524Author(s): Francine Bettio Costa, Ana Kely Rufino Souza, Junior Reis Silva, João Carlos Silos Moraes, Luiz Antonio de Oliveira Nunes, Luis Humberto da Cunha Andrade, Raouf El-Mallawany, Sandro Marcio LimaAbstractLithium tellurite glasses with xTeO2 + (100 − x)Li2O nominal composition, where x = 95, 90, 85, 80, 75 and 70 mol%, have been prepared to investigate the dependence of the Te4+ emission as a function of the lithium modifier. Optical and structural properties of the glasses were explored by using UV&ndas...
Source: Journal of Non Crystalline Solids - September 4, 2019 Category: Chemistry Source Type: research

Aluminum induced crystallization of amorphous Si: Thermal annealing and ion irradiation process
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): G. Maity, R. Singhal, S. Dubey, S. Ojha, P.K. Kulriya, S. Dhar, T. Som, D. Kanjilal, Shiv P. PatelAbstractThe Al-induced crystallization of amorphous (a)-Si under thermal annealing and swift heavy ion irradiation has been investigated. The c-Al (50 nm)/a-Si (150 nm) thin films have been prepared on thermally oxidized Si-substrates. A set of samples have been annealed at temperatures ranging from 100 °C to 500 °C to achieve crystallization. Another set of similar samples have been irradiated at an elevated temper...
Source: Journal of Non Crystalline Solids - August 28, 2019 Category: Chemistry Source Type: research

Effect of lead and zinc oxides on the thermal properties of tellurite glass systems
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): H.A.A. Sidek, S.H. Elazoumi, R. El-Mallawany, M.H.M. Zaid, K.A. Matori, M.K. HalimahAbstractThermal properties of binary (PbO)x(TeO2)1-x, x = 0, 0.10, 0.15, 0.20, 0.25, 0.30 mol% and ternary [ZnO]y[(TeO2)0.7-(PbO)0.3]1-y with y = 0.15, 0.17, 0.20, 0.22, 0.25 mol% were measured. The glass systems were prepared using the conventional melt-quenching technique. The thermal properties of the glasses were investigated using differential scanning calorimetry (DSC) analysis. Thermal analysis of the glasses was realized rega...
Source: Journal of Non Crystalline Solids - August 28, 2019 Category: Chemistry Source Type: research

Effect of melting temperature on the structure of self-crystallized Ba2LaF7 glass-ceramics
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): Weihui Shen, Yong Yang, Zhencai Li, Muhammad Ibrar Khan, Enhao Cao, Dacheng Zhou, Jianbei QiuAbstractThe self-crystallization phenomenon in glass can provide low-phonon energy environment for the up-conversion of luminescence centers. Nevertheless, the crystallization mechanism is not clear, hence the effect of temperature on the self-crystallization of Ba2LaF7: Er3+/Yb3+ glass-ceramics via adjusting its melting temperature has investigated. The self-crystallization fraction of Ba2LaF7 has decreased with the increase in melting...
Source: Journal of Non Crystalline Solids - August 25, 2019 Category: Chemistry Source Type: research

Deformation mechanism of amorphous/crystalline phase-separated alloys: A molecular dynamics study
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): Y.N. Cui, C.X. Peng, Y. Cheng, Y.Y. Wang, L. Wang, S.X. ZhouAbstractIn this paper, molecular dynamics simulations have been performed to explore the deformation mechanism of amorphous/crystalline Cu50Ag50 phase-separated alloys with different crystal fractions during compressive deformation. Our findings indicate that as the crystal fractions increase, the yield strength also increases and there is a conspicuous strain-hardening phenomenon, especially for samples with a large crystal fraction. The cross-interaction of immature ...
Source: Journal of Non Crystalline Solids - August 24, 2019 Category: Chemistry Source Type: research

Optoelectronic properties and carrier transport mechanisms in amorphous SiCN
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): A.V. Sukach, V.V. Tetyorkin, А.І. Тkachuk, O.K. Porada, A.O. Kozak, V.I. Ivaschenko, V.S. ManzharaAbstractAmorphous silicon carbon nitride (a-SiCN) films were prepared on boron-doped silicon and quartz substrates by plasma-enhanced chemical vapor deposition. The films were characterized by using X-ray diffraction spectroscopy, atomic force microscopy, Fourier transform infrared spectroscopy, as well the results of the measurements of optical spectra, photoluminescence (PL) and current-voltage characteristics. The films demon...
Source: Journal of Non Crystalline Solids - August 24, 2019 Category: Chemistry Source Type: research

Luminescent properties of calcium-alumino-silicate glasses (CaAlSi) doped with Sm2O3 and co-doped with Sm2O3 + Eu2O3 for LED glass applications
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): N. Suebsing, C. Bootjomchai, V. Promarak, R. LaopaiboonAbstractA new glass system of calcium-alumino-silicate doped with Sm2O3 and co-doped with Sm2O3 ± Eu2O3 was fabricated in order to improve the efficiency of the red emission for phosphor glass materials. The optical properties of the glass samples were studied by measurements using UV–vis absorption spectra and excitation energy. The results showed that 403 nm of photon energy is effective to elevate the electron in a ground state to an excited state. Thi...
Source: Journal of Non Crystalline Solids - August 24, 2019 Category: Chemistry Source Type: research

Stucture and size of the plastic zone formed during nanoindentation of a metallic glass
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): Karina E. Avila, Stefan Küchemann, Herbert M. UrbassekAbstractUsing molecular dynamics simulation, we study the plastic zone created during nanoindentation of a large CuZr glass system. The plastic zone consists of a core region, in which virtually every atom undergoes plastic rearrangement, and a tail, where the density distribution of the plastically active atoms decays to zero. Compared to crystalline substrates, the plastic zone in metallic glasses is significantly smaller than in crystals. The so-called plastic-zone s...
Source: Journal of Non Crystalline Solids - August 24, 2019 Category: Chemistry Source Type: research

Bulk phase water diffusion is significantly inhibited by inhomogeneity of single non-crystal particle at low relative humidity
In this study, the effect of non-crystalline states on water diffusion is detailed investigated from single multi-component particles levitated in aerosol optical tweezers. We infer the time-dependent particle size from Raman spectra using Mie fitting, thus derive the water diffusion coefficient (Dwater) from particle radius changes during evaporation or condensation processes. In both glassy states (in saccharide particles) and gel states (in MgSO4 particles), the bulk phase water diffusion is shown to be severely restricted, thus limiting the gas-particle water partitioning on the particle surface. The Dwater of glassy p...
Source: Journal of Non Crystalline Solids - August 24, 2019 Category: Chemistry Source Type: research

Combinatorial development and assessment of a Zr-based metallic glass for prospective biomedical applications
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): Muhammad Mudasser Khan, Kashif Mairaj Deen, Waseem HaiderAbstractIn the quest of corrosion-resistant biomaterials, the emergence of metallic glasses is a welcome stimulus, however, their progress is potentially impeded by the complex fabrication routes. This paper explores a Zr40Ti35Ni14Nb11 metallic glass, developed through combinatorial magnetron co-sputtering. Structural characterization of the system via Grazing-Incidence X-Ray Diffraction and Transmission Electron Microscopy coupled with Fourier Transformation demonstrate ...
Source: Journal of Non Crystalline Solids - August 24, 2019 Category: Chemistry Source Type: research

Influence of different alkaline oxide modifiers on VO2+ ions doped zinc borate glasses
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): M. Farouk, K. Abdallauh, M. Attallah, Z.M. Abd El-FattahAbstractGlassy system of composition 20R2O-19ZnO-60B2O3-1V2O5(R is Li, Na and K) was prepared by conventional melting technique. The measured density ρ and calculated molar volume Vm were both found to increase linearly with the atomic number of the alkali element, reflecting the formation of non-bridging oxygen. Additional physical parameters such as vanadium ions concentration, inter-ionic distance of vanadium ions, polaron radius, field strength, refractive index an...
Source: Journal of Non Crystalline Solids - August 23, 2019 Category: Chemistry Source Type: research

Structural and chemical changes in Ga doped GeS glassy alloy
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): Anjli Rana, Bhanu Pratap Singh, Raman SharmaAbstractStructural changes developed in GeS glassy alloy with incorporation of Ga have been investigated using vibrational spectroscopy. Thermal evaporation technique has been employed to deposit thin films of Ge20S80−xGax glassy alloy. Structural transformations in bulk and thin films have been examined from Raman and FTIR spectra recorded at room temperature. Observed left shift in the Raman spectra and right shift in the IR spectra are consequence of increase in reduced mass ...
Source: Journal of Non Crystalline Solids - August 23, 2019 Category: Chemistry Source Type: research

Crystallization behavior, structure and properties of glasses in SrO–Fe2O3–P2O5 system
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): Xiuying Li, Zhuohao Xiao, Yongtao He, Yongqing Wang, Jinzhi Luo, Jijun Shi, Qin Huang, Lingbing KongAbstractCrystallization behavior, structure and properties of the glasses in SrO–Fe2O3–P2O5 ternary system, with the content of P2O5 fixed to be 60, 50 and 40 mol%, were studied systematically. For vitreous samples, thermal expansion coefficients (TEC) and characteristic temperature were obtained by using a thermal dilatometer, while their thermal stability was examined by using a differential scanning calorimeter (...
Source: Journal of Non Crystalline Solids - August 23, 2019 Category: Chemistry Source Type: research

Response to comments on “How to reveal the correct elemental concentration profiles in poled multicomponent silicate glasses from the data of secondary ion mass spectrometry (SIMS)”
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): V.P. Kaasik, A.A. Lipovskii, D.V. Raskhodchikov, I.V. Reshetov, D.K. Tagantsev (Source: Journal of Non Crystalline Solids)
Source: Journal of Non Crystalline Solids - August 23, 2019 Category: Chemistry Source Type: research

Monte Carlo simulation of borosilicate glass dissolution using molecular dynamics-generated glass structures
Publication date: 15 October 2019Source: Journal of Non-Crystalline Solids, Volume 522Author(s): Sebastien Kerisit, Jincheng DuAbstractAtomic-scale insights into borosilicate glass dissolution are critical to the development of waste form corrosion models. While Monte Carlo (MC) simulations have been instrumental in advancing the state of knowledge, all simulations to date have relied on lattices to represent the glass structure, potentially introducing artifacts. A new approach (amorphous MC approach) was developed whereby glass structures generated from molecular dynamics simulations were used as starting points for MC s...
Source: Journal of Non Crystalline Solids - August 13, 2019 Category: Chemistry Source Type: research

Structural study of chalcogenide glasses in the Bi5As35Se60-xTex system
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): Jianhua Zheng, Lei Li, Haiwei Yin, Yang Wang, Huidan Zeng, Jie Wei, Guorong ChenAbstractThe atomic structure of chalcogenide glasses in the composition of As35Se60-xTexBi5 (x = 0, 5, 10, 15, 20) is investigated by XRD, Raman spectroscopy and HR-XPS. All results present the consistent evidences on association of Te addition with the structural evolution of glasses. XRD patterns show that the Te can be added into the As35Se60Bi5 system to substitute Se by maximum 15 mol% without causing crystallization. Raman and HR-XPS spe...
Source: Journal of Non Crystalline Solids - August 13, 2019 Category: Chemistry Source Type: research

Effect of gamma irradiation on some spectroscopic properties of phosphate glass containing samarium ions
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): N.A. El-Alaily, O.I. Sallam, F.M. Ezz-EldinAbstractChanges of FTIR, UV–Visible spectra, photoluminescence with varying Sm content in phosphate glass containing sodium, lead and aluminum were studied. Refractive index values have been measured and their values were listed to be between ~ 1.5–1.7. Furthermore the effect of subjecting this glass to gamma rays was also investigated. The results showed that glass containing 1%Sm had the highest NBOs according to FTIR, UV-Visble results. The optical energy band gap and Ur...
Source: Journal of Non Crystalline Solids - August 11, 2019 Category: Chemistry Source Type: research

Stress interaction and crack propagation behavior of glass ceramics under multi-scratches
Publication date: 1 November 2019Source: Journal of Non-Crystalline Solids, Volume 523Author(s): Xue Yang, Zhongjun Qiu, Yuge WangAbstractThe interaction between scratches has a significant influence on the material removal mechanism during scratching glass ceramic. To clarify the interaction mechanism, an analytical model of stress interference considering scratch distance is established based on the interaction features between scratches to analyse the relationship between stress distribution and crack propagation. A double scratch experiment with different scratch distances was conducted on lithium aluminosilicate (LAS)...
Source: Journal of Non Crystalline Solids - August 11, 2019 Category: Chemistry Source Type: research

Effect of thermal annealing on structures and properties of Yb3+/Al3+/P5+ co-doped silica glasses
Publication date: 15 October 2019Source: Journal of Non-Crystalline Solids, Volume 522Author(s): Mengting Guo, Chongyun Shao, Feng Shi, Fan Wang, Shikai Wang, Chunlei Yu, Lei Zhang, Jinjun Ren, Lili HuAbstractHomogeneous 89.9SiO2-4Al2O3-6P2O5–0.1Yb2O3/Eu2O3 glasses were fabricated via a sol−gel method and sintered under vacuum at high temperature, and subsequently they were annealed at 850 °C for 15 and 75 h. Effect of thermal annealing time on structures and properties of glasses was systematically investigated. Solid state nuclear magnetic resonance (SSNMR) and Raman scattering spectra were employed t...
Source: Journal of Non Crystalline Solids - August 9, 2019 Category: Chemistry Source Type: research

The glass-forming region and 2.7 μm emission of Er3+-doped TeO2−Ta2O5−ZnO tellurite glass
Publication date: 15 October 2019Source: Journal of Non-Crystalline Solids, Volume 522Author(s): J.L. Liu, Y.B. Xiao, S.J. Huang, L.Y. Mao, W.C. Wang, Q.Y. ZhangAbstractAn Er3+-doped TeO2 − Ta2O5 − ZnO (TTZ) tellurite glass has been investigated to explore its possible application in mid-infrared laser glass and fiber lasers. Glass-forming region of the ternary TTZ glass system was determined based on the thermodynamic calculation and experiments. Physical and optical properties of the TTZ glass were characterized in detail by using Raman, different scanning calorimetry, luminescence spectra, and fluore...
Source: Journal of Non Crystalline Solids - August 9, 2019 Category: Chemistry Source Type: research

Comparison of tribological behavior of Fe-based metallic glass coatings fabricated by cold spraying and high velocity air fuel spraying
Publication date: 15 October 2019Source: Journal of Non-Crystalline Solids, Volume 522Author(s): Juan Su, Jia-jie Kang, Wen Yue, Guo-zheng Ma, Zhi-qiang Fu, Li-na Zhu, Ding-shun She, Hai-dou Wang, Cheng-biao WangAbstractHigh wear between surfaces may lead to an increase of cost of production in mechanical engineering industry. To solve this problem, Fe-based amorphous coatings prepared using appropriate technology can provide an effective and economical surface protection. In this work, Fe-based metallic glass powders were deposited by cold gas dynamic spraying (CGDS) and high velocity air fuel (HVAF) technology onto 35CrM...
Source: Journal of Non Crystalline Solids - August 9, 2019 Category: Chemistry Source Type: research