Synthesis and multimethodological characterization of neodymium substituted nickel tungstates and molybdates solid solution Ni Ndx (W,Mo)O4, (0 ≤ x ≤ 0.2)

Publication date: Available online 17 November 2018Source: Inorganic Chemistry CommunicationsAuthor(s): Asmaa El Khouri, Abdelouahad Zegzouti, Mohammed ElaatmaniAbstractNew series of neodymium substituted nickel tungstates and molybdates NiNdxM′O4 (M′ = W,Mo and x = 0%, 10%, 20%) were synthesized by standard solid state route at high temperature T = 1000 °C. These materials, were characterized by powder X-Ray diffraction technique (XRD), which confirmed that both series of tungstates and molybdates crystallized in monoclinic structure with space groups(P2/c, C2/m) respectively and behaved as a quasi-ideal solid solution. Scanning Electron Microscopy (SEM) experiments showed the presence of grains with irregular sizes developed within larger aggregations, while EDS semi-quantitative analyses confirmed the nominal compositions for all the phases. Active vibration modes were investigated by Fourier Transform InfraRed (FTIR) and Raman techniques, the group theoretical calculation predicted 36 vibrational modes. The presence of characteristic frequencies assigned to components ʋ1 and ʋ3 confirmed the existence of WO6 and MoO6 polyhedra in the structures, non-vibrational bands appearing in Raman spectra were attributed to laser-excited luminescence of neodymium element.Graphical abstractSolid state synthesis method of Ni NdxM′O4 (M′ = W,Mo,x = 0%, 10%, 20%) phases.
Source: Inorganic Chemistry Communications - Category: Chemistry Source Type: research
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