Phys. Rev. B 59, 8526–8529 (1999)Equation of state of tantalum to 174 GPaReceived 16 March 1998; revised 16 October 1998; published in the issue dated 1 April 1999 The volume compression of tantalum was measured to 174 GPa in a diamond-anvil cell using angle-resolved synchrotron x-ray diffraction. A third-order Birch-Murnaghan equation-of-state constrains the compression data rather well with the zero-pressure isothermal bulk modulus B0T=194.7(4.8)GPa and the first pressure derivative B′=3.4(0.1). These values are consistent with the previous ultrasonic results, B0S=196GPa and B′=3.8, but are different from the previous x-ray compression results, B0T=231GPa and B′=2.5. The current compression data also demonstrate that the bcc phase of Ta continues to be stable to 174 GPa, which qualifies tantalum for a pressure standard in static high-pressure experiments. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.59.8526
DOI:
10.1103/PhysRevB.59.8526
PACS:
64.90.+b, 64.30.+t, 64.10.+h
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