High-Pressure, High-Temperature Syntheses in the B-C-N-O System

Laurence Garvie; Hervé Hubert; William Petuskey; Paul F. McMillan; P R Buseck

doi:10.1006/jssc.1997.7583

High-Pressure, High-Temperature Syntheses in the B-C-N-O System

Laurence Garvie, Hervé Hubert, William Petuskey, Paul F. McMillan, P R Buseck

Research output: Contribution to journal › Article › peer-review

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Abstract

Materials with structures related to that ofα-rhombohedral B (α-rh B) were synthesized in the B-C-N-O system at high pressures and temperatures. Electron energy-loss spectroscopy with a transmission electron microscope was used to determine the stoichiometry of these phases. The energy-loss near-edge structure of the core-loss edges provided qualitative information on the bonding and local band structure. Extensive solid solution between B₄C and B₆O was found in some of the syntheses as well as nanorods with composition near B₆C in one experiment. The analysis of the newα-rh B-type material, nominally B₆N, provided a mean composition of B₆N_0.92. The B K edge from B₆N is similar to that from other icosahedral boron-rich phases, more specifically to B₆O, although differences near the conduction-band onset reveal a high level of unoccupied states within the band gap.

Original language	English (US)
Pages (from-to)	365-371
Number of pages	7
Journal	Journal of Solid State Chemistry
Volume	133
Issue number	2
DOIs	https://doi.org/10.1006/jssc.1997.7583
State	Published - Nov 1 1997

ASJC Scopus subject areas

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

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10.1006/jssc.1997.7583

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title = "High-Pressure, High-Temperature Syntheses in the B-C-N-O System",

abstract = "Materials with structures related to that ofα-rhombohedral B (α-rh B) were synthesized in the B-C-N-O system at high pressures and temperatures. Electron energy-loss spectroscopy with a transmission electron microscope was used to determine the stoichiometry of these phases. The energy-loss near-edge structure of the core-loss edges provided qualitative information on the bonding and local band structure. Extensive solid solution between B4C and B6O was found in some of the syntheses as well as nanorods with composition near B6C in one experiment. The analysis of the newα-rh B-type material, nominally B6N, provided a mean composition of B6N0.92. The B K edge from B6N is similar to that from other icosahedral boron-rich phases, more specifically to B6O, although differences near the conduction-band onset reveal a high level of unoccupied states within the band gap.",

author = "Laurence Garvie and Herv{\'e} Hubert and William Petuskey and McMillan, {Paul F.} and Buseck, {P R}",

note = "Funding Information: We thank T. Aselage (Sandia National Labs) for supplying samples of α-B, B4.3C, and B9C and P. Rez (Arizona State University) for his stimulating discussions on near-edge structure. This study was supported by the grants from the National Science Foundation, EAR-9219376 (to L.A.J.G. and P.R.B.) and MRG DMR-91-21570. EELS spectra were acquired at the Center for High Resolution Electron Microscopy, which is also supported by the National Science Foundation, Grant DMR-8611609.",

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doi = "10.1006/jssc.1997.7583",

language = "English (US)",

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AU - McMillan, Paul F.

AU - Buseck, P R

N1 - Funding Information: We thank T. Aselage (Sandia National Labs) for supplying samples of α-B, B4.3C, and B9C and P. Rez (Arizona State University) for his stimulating discussions on near-edge structure. This study was supported by the grants from the National Science Foundation, EAR-9219376 (to L.A.J.G. and P.R.B.) and MRG DMR-91-21570. EELS spectra were acquired at the Center for High Resolution Electron Microscopy, which is also supported by the National Science Foundation, Grant DMR-8611609.

PY - 1997/11/1

Y1 - 1997/11/1

N2 - Materials with structures related to that ofα-rhombohedral B (α-rh B) were synthesized in the B-C-N-O system at high pressures and temperatures. Electron energy-loss spectroscopy with a transmission electron microscope was used to determine the stoichiometry of these phases. The energy-loss near-edge structure of the core-loss edges provided qualitative information on the bonding and local band structure. Extensive solid solution between B4C and B6O was found in some of the syntheses as well as nanorods with composition near B6C in one experiment. The analysis of the newα-rh B-type material, nominally B6N, provided a mean composition of B6N0.92. The B K edge from B6N is similar to that from other icosahedral boron-rich phases, more specifically to B6O, although differences near the conduction-band onset reveal a high level of unoccupied states within the band gap.

AB - Materials with structures related to that ofα-rhombohedral B (α-rh B) were synthesized in the B-C-N-O system at high pressures and temperatures. Electron energy-loss spectroscopy with a transmission electron microscope was used to determine the stoichiometry of these phases. The energy-loss near-edge structure of the core-loss edges provided qualitative information on the bonding and local band structure. Extensive solid solution between B4C and B6O was found in some of the syntheses as well as nanorods with composition near B6C in one experiment. The analysis of the newα-rh B-type material, nominally B6N, provided a mean composition of B6N0.92. The B K edge from B6N is similar to that from other icosahedral boron-rich phases, more specifically to B6O, although differences near the conduction-band onset reveal a high level of unoccupied states within the band gap.

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High-Pressure, High-Temperature Syntheses in the B-C-N-O System

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