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Applied Physics Letters / Volume 95 / Issue 21 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 95, 211906 (2009); http://dx.doi.org/10.1063/1.3268457 (3 pages)

Nanocrystalline tungsten carbide: As incompressible as diamond

Zhijun Lin1, Lin Wang2,3, Jianzhong Zhang1, Ho-kwang Mao2, and Yusheng Zhao1

1LANSCE Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
2HPSynC, Carnegie Institution of Washington, 9700 South Cass Avenue, Argonne, Illinois 60439, USA
3State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People's Republic of China

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(Received 21 September 2009; accepted 3 November 2009; published online 25 November 2009)

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.

© 2009 American Institute of Physics

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KEYWORDS and PACS

Keywords

ab initio calculations, compressibility, density functional theory, elastic moduli, nanostructured materials, synchrotron radiation, X-ray diffraction

PACS

  • 81.40.Lm

    Deformation, plasticity, and creep

  • 62.20.F-

    Deformation and plasticity

  • 81.40.Jj

    Elasticity and anelasticity, stress-strain relations

  • 62.20.de

    Elastic moduli

  • 62.23.-c

    Structural classes of nanoscale systems

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3268457

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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