Journal
HIGH PRESSURE RESEARCH
Volume 31, Issue 2, Pages 275-282Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/08957959.2011.582871
Keywords
tungsten tetraboride; equation of state; low-compressibility; synchrotron X-ray diffraction
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Funding
- National Natural Science Foundation of China [11027405]
- National Natural Science Foundation of China - NSAF [10976018]
- China 973 Program [2011CB808200]
- Grants-in-Aid for Scientific Research [10F00029] Funding Source: KAKEN
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Diamond anvil cell synchrotron X-ray diffraction (XRD) experiments have been carried out on submicron-sized tungsten tetraboride (WB4) at room temperature up to 50.8GPa with a silicone oil pressure medium. The crystal structure of WB4 remains unchanged up to the highest pressure. The isothermal bulk modulus K0 and its pressure derivative, [image omitted], have been determined from the present compression by fitting the third-order Birch-Murnaghan equation of state: K0=325 +/- 9GPa and [image omitted]. The high value of the bulk modulus shows that WB4 has high stiffness and/or low-compressibility. Moreover, we also found that the compression behavior of the unit cell axes (a- and c-axes) of WB4 demonstrates an anisotropic nature of compressibility.
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