Melting curve and phase diagram of vanadium under high-pressure and high-temperature conditions

Errandonea, D; Macleod, SG; Burakovsky, L; Santamaria-Perez, D; Proctor, JE; Cynn, H; Mezouar, M

Abstract

We report a combined experimental and theoretical study of the melting curve
and the structural behavior of vanadium under extreme pressure and temperature. We
performed powder x-ray diffraction experiments up to 120 GPa and 4000 K, determining
the phase boundary of the bcc-to-rhombohedral transition and melting temperatures at
different pressures. Melting temperatures have also been established from the observation
of temperature plateaus during laser heating, and the results from the density-functional
theory calculations. Results obtained from our experiments and calculations are fully
consistent and lead to an accurate determination of the melting curve of vanadium. These
results are discussed in comparison with previous studies. The melting temperatures
determined in this study are higher than those previously obtained using the speckle
method, but also considerably lower than those obtained from shock-wave experiments and
linear muffin-tin orbital calculations. Finally, a high-pressure high-temperature equation of
state up to 120 GPa and 2800 K has also been determined.

Citation

Errandonea, D., Macleod, S., Burakovsky, L., Santamaria-Perez, D., Proctor, J., Cynn, H., & Mezouar, M. (2019). Melting curve and phase diagram of vanadium under high-pressure and high-temperature conditions. Physical Review B, 100(9), https://doi.org/10.1103/PhysRevB.100.094111

• Journal Article Type: Article
• Acceptance Date: Sep 19, 2019
• Publication Date: Sep 30, 2019
• Deposit Date: Oct 15, 2019
• Publicly Available Date: Oct 15, 2019
• Journal: Physical Review B (PRB)
• Print ISSN: 2469-9950
• Electronic ISSN: 2469-9969
• Publisher: American Physical Society
• Volume: 100
• Issue: 9
• DOI: https://doi.org/10.1103/PhysRevB.100.094111
• Publisher URL: https://doi.org/10.1103/PhysRevB.100.094111
• Related Public URLs: https://journals.aps.org/prb/