Equation of state of tantalum to 174 GPa

Journal Article · Thu Apr 01 04:00:00 EST 1999 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.59.8526· OSTI ID:341178

Cynn, H; Yoo, C ^[1]

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1. Lawrence Livermore National Laboratory, University of California, Livermore, California 94550 (United States)

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 B{sub 0T}=194.7(4.8)&hthinsp;GPa and the first pressure derivative B{sup {prime}}=3.4(0.1). These values are consistent with the previous ultrasonic results, B{sub 0S}=196&hthinsp;GPa and B{sup {prime}}=3.8, but are different from the previous x-ray compression results, B{sub 0T}=231&hthinsp;GPa and B{sup {prime}}=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. {copyright} {ital 1999} {ital The American Physical Society}

• OSTI ID: 341178
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 13 Vol. 59; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BCC LATTICES
COMPRESSIBILITY
COMPRESSION
CRYSTAL STRUCTURE
EQUATIONS OF STATE
TANTALUM
VERY HIGH PRESSURE
X-RAY DIFFRACTION