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High-pressure study of low-compressibility Ta2N

journal contribution
posted on 2007-09-18, 00:00 authored by Weiwei LeiWeiwei Lei, Dan Liu, X Li, J Zhang, Q Zhou, J Hu, Q Cui, G Zou
Room temperature synchrotron x-ray diffraction experiments were performed on nanocrystal Ta2N in a diamond anvil cell to a pressure of 55.48 GPa. This nitride is a well-known kind of high-hardness material, and it is found to be highly incompressible. The structure is stable with no phase transitions observed in this pressure range. The zero-pressure bulk modulus and its pressure derivative at ambient pressure are B0 = 360 ± 3 GPa, B0' = 4, and in room conditions, the a and c parameters are 3.054 Å, 4.996 Å, respectively. The bulk modulus of Ta2N is greater than those of TaC, ε-TaN, Cr2N and MoN. The differences in bulk moduli might be due to the differences in structure and the cohesive energy among these phases.

History

Journal

Journal of physics : condensed matter

Volume

19

Issue

42

Pagination

1 - 1

Publisher

Institute of Physics Publishing

Location

Bristol, England

ISSN

0953-8984

eISSN

1361-648X

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2007, Institute of Physics Publishing

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