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Equations of state of rhodium, iridium and their alloys up to 70 GPa

Title data

Yusenko, Kirill V. ; Khandarkhaeva, Saiana ; Fedotenko, Timofey ; Pakhomova, Anna ; Gromilov, Sergey A. ; Dubrovinsky, Leonid ; Dubrovinskaia, Natalia:
Equations of state of rhodium, iridium and their alloys up to 70 GPa.
In: Journal of Alloys and Compounds. Vol. 788 (2019) . - pp. 212-218.
ISSN 0925-8388
DOI: https://doi.org/10.1016/j.jallcom.2019.02.206

Abstract in another language

Knowledge of the compressional and thermal behaviour of metals and alloys is of a high fundamental and applied value. In this work, we studied the behaviour of Ir, Rh, and their fcc-structured alloys, Ir0.42Rh0.58 and Ir0.26Os0.05Pt0.31Rh0.23Ru0.15, up to 70 GPa using the diamond anvil cell technique with synchrotron X-ray diffraction. We found that all these materials are structurally stable upon room-temperature hydrostatic compression in the whole pressure interval, as well as upon heating to 2273 K both at ambient and high pressure. Rh, Ir0.42Rh0.58 and Ir0.26Os0.05Pt0.31Rh0.23Ru0.15 were investigated under static compression for the first time. According to our data, the compressibility of Ir, Rh, fcc–Ir0.42Rh0.58, and fcc–Ir0.26Os0.05Pt0.31Rh0.23Ru0.15, can be described with the 3rd order Birch-Murnaghan equation of state with the following parameters: V0 = 14.14(6) Å3·atom−1, B0 = 341(10) GPa, and B0' = 4.7(3); V0 = 13.73(7) Å3·atom−1, B0 = 301(9) GPa, and B0' = 3.1(2); V0 = 13.90(8) Å3·atom−1, B0 = 317(17) GPa, and B0' = 6.0(5); V0 = 14.16(9) Å3·atom−1, B0 = 300(22) GPa, B0' = 6(1), where V0 is the unit cell volume, B0 and B0' – are the bulk modulus and its pressure derivative.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Rhodium-iridium alloys; High-entropy alloys; Equation of state; High-pressure high-temperature
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Professur Materialphysik und Technologie bei extremen Bedingungen
Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Professur Materialphysik und Technologie bei extremen Bedingungen > Professur Materialphysik und Technologie bei extremen Bedingungen - Univ.-Prof. Dr. Natalia Doubrovinckaia
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 11 Jul 2019 08:37
Last Modified: 11 Jul 2019 08:37
URI: https://eref.uni-bayreuth.de/id/eprint/49903