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 journalArticle

12 Citations (Scopus)

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
StatePublished - 1999

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Boron nitride
Boron
Carbon
Oxygen
Graphite
Electron energy loss spectroscopy
Crucibles
Energy dissipation
Electron microscopes
Electrons
Chemical analysis
boron nitride

Keywords

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

ASJC Scopus subject areas

  • Metals and Alloys

Cite this

BN0.5O0.4C0.1 : Carbon- and oxygen-substituted hexagonal BN. / Garvie, Laurence; Hubert, H.; Rez, Peter; McMillan, P. F.; Buseck, P R.

In: Journal of Alloys and Compounds, Vol. 290, No. 1-2, 1999, p. 34-40.

Research output: Contribution to journalArticle

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T2 - Carbon- and oxygen-substituted hexagonal BN

AU - Garvie, Laurence

AU - Hubert, H.

AU - Rez, Peter

AU - McMillan, P. F.

AU - Buseck, P R

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N2 - 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.

AB - 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.

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KW - High temperature

KW - Solid solution

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