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

DOI: 10.1016/j.jallcom.2019.02.206 DOI Help

Authors: Kirill V. Yusenko (BAM Federal Institute of Materials Research and Testing) , Saiana Khandarkhaeva ( , Timofey Fedotenko (University of Bayreuth) , Anna Pakhomova (Deutsches Elektronen-Synchrotron) , Sergey A. Gromilov (Nikolaev Institute of Inorganic Chemistry) , Leonid Dubrovinsky (Bayerisches Geoinstitut, Universität Bayreuth) , Natalia Dubrovinskaia (University of Bayreuth)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Alloys And Compounds

State: Published (Approved)
Published: February 2019
Diamond Proposal Number(s): 15792

Abstract: 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.

Journal Keywords: Rhodium-iridium alloys; High-entropy alloys; Equation of state; High-pressure high-temperature

Subject Areas: Materials

Instruments: I11-High Resolution Powder Diffraction

Other Facilities: PETRA III