TITLE

Nanocrystalline tungsten carbide: As incompressible as diamond

AUTHOR(S)
Zhijun Lin; Lin Wang; Jianzhong Zhang; Ho-kwang Mao; Yusheng Zhao
PUB. DATE
November 2009
SOURCE
Applied Physics Letters;11/23/2009, Vol. 95 Issue 21, p211906
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We investigate the compressibility of nanocrystalline tungsten carbide (nano-WC) using synchrotron x-ray diffraction. Nano-WC displays a bulk modulus (452 GPa) comparable to that of diamond; it is 10%–15% larger than previously reported values for bulk WC. This finding is consistent with a generalized model of nanocrystal with a compressed surface layer. The linear bulk moduli of nano-WC along a- and c-axes were determined to be 407 and 546 GPa, respectively. First-principles density functional theory (DFT) calculations confirm the experimental observations of an anisotropic linear compressibility and a lower bulk modulus for microsized WC.
ACCESSION #
45478093

 

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