BN0.5O0.4C0.1: Carbon- and oxygen-substituted hexagonal BN

Laurence Garvie, H. Hubert, Peter Rez, P. F. McMillan, P R Buseck

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Hexagonal boron nitride (hex BN) containing significant amounts of C and O substituting for N (hex BCNO) was synthesized at 75 kbar and 1700°C from mixtures of C, B2O3, and amorphous B contained in a hex BN crucible. Hex BCNO is a minor constituent of the product and occurs as small, <30 nm diameter, rounded pseudohexagonal particles adhering to materials with the α-rhombohedral B structure. Electron energy-loss spectroscopy with a transmission electron microscope was used to quantify their elemental ratios. Up to 50% of the N in hex BN is replaced by C and O, e.g., BN0.49O0.38C0.11. The electron energy-loss near-edge fine structure of the core-loss edges was used to elucidate the possible structures of hex BCNO. The core-loss edges of B, C, N, and O exhibit orientation-dependent intensity changes, which indicates that they occupy similar anisotropic bonding sites in graphite-like BCNO layers. For a composition of BN0.5O0.4C0.1, regions with B-N3, B-N2O, and B-NO2 units predominate. In addition, some grains have significant quantities of B-O3 and B-C3 units. Boron-boron bonding is either absent or infrequent.

Original languageEnglish (US)
Pages (from-to)34-40
Number of pages7
JournalJournal of Alloys and Compounds
Volume290
Issue number1-2
DOIs
StatePublished - Jan 1 1999

Keywords

  • Boron nitride
  • Electron energy-loss spectroscopy
  • High pressure
  • High temperature
  • Solid solution

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'BN<sub>0.5</sub>O<sub>0.4</sub>C<sub>0.1</sub>: Carbon- and oxygen-substituted hexagonal BN'. Together they form a unique fingerprint.

Cite this