Physics – Condensed Matter – Materials Science
Scientific paper
2012-01-02
J. Appl. Phys. 111, 033511 (2012)
Physics
Condensed Matter
Materials Science
Scientific paper
The high-pressure melting curve of tantalum (Ta) has been the center of a long-standing controversy. Sound velocities along the Hugoniot curve are expected to help in understanding this issue. To that end, we employed a direct-reverse impact technique and velocity interferometry to determine sound velocities of Ta under shock compression in the 10-110 GPa pressure range. The measured longitudinal sound velocities show an obvious kink at ~60 GPa as a function of shock pressure, while the bulk sound velocities show no discontinuity. Such observation could result from a structural transformation associated with a negligible volume change or an electronic topological transition.
Cai Lingcang
Dai Chengda
Hu Jianbo
Liu Zijiang
Tan Hua
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