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Structure and phase characteristics of amorphous boron–carbon–nitrogen under high pressure and high temperature

Published online by Cambridge University Press:  31 January 2011

Jianyu Huang ,
Yuntian T. Zhu  and
Hirotaro Mori
Jianyu Huang*
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, MS G755, Los Alamos, New Mexico 87545, and Research Center for Ultra-High Electron Voltage Microscopy, Osaka University, Yamada-oka, Suita, Osaka 565-0871, Japan
Yuntian T. Zhu
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology Division, MS G755, Los Alamos, New Mexico 87545
Hirotaro Mori
Affiliation:
Research Center for Ultra-High Voltage Electron Microscopy, Osaka University, Yamada-oka, Suita, Osaka 565-0871, Japan
*
a)Address all correspondence to this author.[email protected]
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Abstract

An amorphous boron–carbon–nitrogen (a-BCN) phase was synthesized by ball milling of a mixture of hexagonal BN (h-BN) and graphite with a nominal composition of (BN)0.5C0.5 in atomic ratio. Electron energy-loss spectroscopy studies indicated that the bonding of the a-BCN is in an sp2 configuration and the mixing between the BN and the C species was achieved at a nanometer scale, but the a-BCN phase was more likely a mechanical mixture rather than a chemical mixture. High-pressure and high-temperature (HPHT) treatment at 7.7 GPa and 2300 °C of the a-BCN phase resulted in complete segregation of the carbon and BN species, forming a nanocrystalline composite material comprising cubic BN (c-BN), amorphous carbon, and turbostratic graphite. The grain size of the c-BN phase was about 70 nm. No mutual solubilities between c-BN and carbon were found, and the two different species (C and BN) were well separated. An epitaxial relationship, i.e., the (0002) planes of graphite being parallel to the (111) planes of c-BN, was also found. The formation of ternary BCN phases was never found in the present experiment. Our experimental results also suggest the possibility of synthesizing c-BN grains encapsulated with graphite under controlled HPHT conditions.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 4 , April 2001 , pp. 1178 - 1184
Copyright
Copyright © Materials Research Society 2001

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