Effect of synthesis conditions of BCNO on the formation and structural ordering of boron nitride at high temperatures

Publication date: Available online 18 September 2018Source: Journal of Solid State ChemistryAuthor(s): Metin Örnek, Chawon Hwang, Sisi Xiang, Kelvin Y. Xie, Anthony Etzold, Bruce Yang, Richard A. HaberAbstractWe have investigated the effect of synthesis conditions of BCNO compounds on BN formation and its structural ordering. BCNO compounds were synthesized from boric acid (H3BO3)-melamine (C3H6N6) mixtures with various molar ratios (H3BO3:C3H6N6 = 1:1 to 6:1) at 400 °C. The BCNO compounds were then subjected to post heating between 1400 °C and 1800°C under argon flow. The final products were crystalline BN with hexagonal symmetry exhibiting varying degrees of structural ordering. As the H3BO3 to C3H6N6 ratio in the starting composition is increased, BN formation temperature decreases and the structural ordering of BN increases. Post heating at higher temperature also promotes BN formation and structural ordering. The findings indicate that synthesis and structural ordering of BN can be tailored by controlling starting composition and post heating temperature. These observations may provide a guideline to synthesize high or low-density polymorphs of BN at reduced pressure, temperature, or both.Graphical AbstractBoron nitrides formed from BCNO compounds exhibited higher degree of structural ordering during post-heating when higher H3BO3 to C3H6N6 molar ratios were initially used to synthesize BCNOs.

Source: Journal of Solid State Chemistry - September 18, 2018 Category: Chemistry Source Type: research