Characterization of the high-pressure and high-temperature phase diagram and equation of state of chromium.

Anzellini, S; Errandonea, D; Burakovsky, L; Proctor, JE; Turnbull, R; Beavers, C

Abstract

The high-pressure and high-temperature phase diagram of chromium has been investigated both experimentally (in situ), using a laser-heated diamond-anvil cell technique coupled with synchrotron powder X-ray diffraction, and theoretically, using ab initio density-functional theory simulations. In the pressure-temperature range covered experimentally (up to 90 GPa and 4500 K, respectively) only the solid body-centred-cubic and liquid phases of chromium have been observed. Experiments and computer calculations give melting curves in agreement with each other that can both be described by the Simon-Glatzel equation [Formula: see text]. In addition, a quasi-hydrostatic equation of state at ambient temperature has been experimentally characterized up to 131 GPa and compared with the present simulations. Both methods give very similar third-order Birch-Murnaghan equations of state with bulk moduli of 182-185 GPa and respective pressure derivatives of 4.74-5.15. According to the present calculations, the obtained melting curve and equation of state are valid up to at least 815 GPa, at which pressure the melting temperature is 9310 K. Finally, from the obtained results, it was possible to determine a thermal equation of state of chromium valid up to 65 GPa and 2100 K.

Citation

Anzellini, S., Errandonea, D., Burakovsky, L., Proctor, J., Turnbull, R., & Beavers, C. (2022). Characterization of the high-pressure and high-temperature phase diagram and equation of state of chromium. Scientific reports, 12(1), 6727. https://doi.org/10.1038/s41598-022-10523-2

• Journal Article Type: Article
• Acceptance Date: Apr 1, 2022
• Online Publication Date: Apr 25, 2022
• Publication Date: Apr 25, 2022
• Deposit Date: Jul 29, 2022
• Publicly Available Date: Jul 29, 2022
• Journal: Scientific reports
• Print ISSN: 2045-2322
• Publisher: Nature Publishing Group
• Volume: 12
• Issue: 1
• Pages: 6727
• DOI: https://doi.org/10.1038/s41598-022-10523-2
• Publisher URL: https://doi.org/10.1038/s41598-022-10523-2
• Related Public URLs: https://europepmc.org/articles/PMC9038929; https://europepmc.org/articles/PMC9038929?pdf=render
• Additional Information: Funders : Generalitat Valenciana;Juan de la Cierva Formacion;Ministerio de Ciencia e Innovación;European Regional Development Fund; Projects : Prometeo/2018/123 EFIMAT;FJC2018-036185-I;PID2019-106383GB-C41;RED2018-102612-T