TY - JOUR

T1 - Equations of state of rhodium, iridium and their alloys up to 70 GPa

AU - Yusenko, Kirill V.

AU - Khandarkhaeva, Saiana

AU - Fedotenko, Timofey

AU - Pakhomova, Anna

AU - Gromilov, Sergey A.

AU - Dubrovinsky, Leonid

AU - Dubrovinskaia, Natalia

N1 - Publisher Copyright: © 2019 Elsevier B.V.

PY - 2019/6/5

Y1 - 2019/6/5

N2 - 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, Ir 0.42 Rh 0.58 and Ir 0.26 Os 0.05 Pt 0.31 Rh 0.23 Ru 0.15 , 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, Ir 0.42 Rh 0.58 and Ir 0.26 Os 0.05 Pt 0.31 Rh 0.23 Ru 0.15 were investigated under static compression for the first time. According to our data, the compressibility of Ir, Rh, fcc–Ir 0.42 Rh 0.58 , and fcc–Ir 0.26 Os 0.05 Pt 0.31 Rh 0.23 Ru 0.15 , can be described with the 3rd order Birch-Murnaghan equation of state with the following parameters: V 0 = 14.14(6) Å 3 ·atom −1 , B 0 = 341(10) GPa, and B 0 ' = 4.7(3); V 0 = 13.73(7) Å 3 ·atom −1 , B 0 = 301(9) GPa, and B 0 ' = 3.1(2); V 0 = 13.90(8) Å 3 ·atom −1 , B 0 = 317(17) GPa, and B 0 ' = 6.0(5); V 0 = 14.16(9) Å 3 ·atom −1 , B 0 = 300(22) GPa, B 0 ' = 6(1), where V 0 is the unit cell volume, B 0 and B 0 ' – are the bulk modulus and its pressure derivative.

AB - 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, Ir 0.42 Rh 0.58 and Ir 0.26 Os 0.05 Pt 0.31 Rh 0.23 Ru 0.15 , 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, Ir 0.42 Rh 0.58 and Ir 0.26 Os 0.05 Pt 0.31 Rh 0.23 Ru 0.15 were investigated under static compression for the first time. According to our data, the compressibility of Ir, Rh, fcc–Ir 0.42 Rh 0.58 , and fcc–Ir 0.26 Os 0.05 Pt 0.31 Rh 0.23 Ru 0.15 , can be described with the 3rd order Birch-Murnaghan equation of state with the following parameters: V 0 = 14.14(6) Å 3 ·atom −1 , B 0 = 341(10) GPa, and B 0 ' = 4.7(3); V 0 = 13.73(7) Å 3 ·atom −1 , B 0 = 301(9) GPa, and B 0 ' = 3.1(2); V 0 = 13.90(8) Å 3 ·atom −1 , B 0 = 317(17) GPa, and B 0 ' = 6.0(5); V 0 = 14.16(9) Å 3 ·atom −1 , B 0 = 300(22) GPa, B 0 ' = 6(1), where V 0 is the unit cell volume, B 0 and B 0 ' – are the bulk modulus and its pressure derivative.

KW - Equation of state

KW - High-entropy alloys

KW - High-pressure high-temperature

KW - Rhodium-iridium alloys

KW - OS

KW - COMPRESSIBILITY

KW - IR

KW - ELECTROCATALYTIC ACTIVITY

KW - PRESSURE

KW - RE

KW - METALS

KW - DIFFRACTION

KW - BINARY-ALLOYS

KW - EXTREME CONDITIONS

UR - http://www.scopus.com/inward/record.url?scp=85061913295&partnerID=8YFLogxK

U2 - 10.1016/j.jallcom.2019.02.206

DO - 10.1016/j.jallcom.2019.02.206

M3 - Article

AN - SCOPUS:85061913295

VL - 788

SP - 212

EP - 218

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

SN - 0925-8388

ER -