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

Metin Örnek, Chawon Hwang, Sisi Xiang, Kelvin Y. Xie, Anthony Etzold, Bruce Yang, Richard A. Haber

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We 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.

Original languageEnglish (US)
Pages (from-to)212-219
Number of pages8
JournalJournal of Solid State Chemistry
Volume269
DOIs
StatePublished - Jan 2019

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

Keywords

  • Amorphous
  • BCNO
  • Boron nitride
  • Phase transformation
  • Structural ordering
  • Turbostacking faults

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