Compressibility of Ir-Os alloys under high pressure

JOURNAL OF ALLOYS AND COMPOUNDS

卷:622

Article

Yusenko, Kirill V.¹  Bykova, Elena^2,3  Bykov, Maxim⁴  Gromilov, Sergey A.^5,6  Kurnosov, Alexander V.³  Prescher, Clemens⁷  Prakapenka, Vitali B.⁷  Hanfland, Michael⁸  van Smaalen, Sander⁴  Margadonna, Serena¹  Dubrovinsky, Leonid S.³ 

[1] Univ Oslo, Ctr Mat Sci & Nanotechnol, Dept Chem, NO-0315 Oslo, Norway

[2] Univ Bayreuth, Inst Phys, Lehrstuhl Kristallog, D-95440 Bayreuth, Germany

[3] Univ Bayreuth, Bayer Geoinst, D-95440 Bayreuth, Germany

[4] Univ Bayreuth, Crystallog Lab, D-95440 Bayreuth, Germany

[5] Novosibirsk State Univ, Dept Phys, Novosibirsk 630090, Russia

[6] Nikolaev Inst Inorgan Chem, Dept Crystal Chem, Novosibirsk 630090, Russia

[7] Univ Chicago, Ctr Adv Radiat Sources, Chicago, IL 60637 USA

[8] Polygone Sci Louis Neel, European Synchrotron Radiat Facil, F-38000 Grenoble, France

关键词: High-pressure;    Alloys;    Iridium;    Osmium;   

DOI  :  10.1016/j.jallcom.2014.09.210

来源: Elsevier

【 摘 要 】

Several fcc- and hcp-structured Ir-Os alloys were prepared from single-source precursors in hydrogen atmosphere at 873 K. Their atomic volumes measured at ambient conditions using powder X-ray diffraction follow nearly linear dependence as a function of composition. Alloys have been studied up to 30 GPa at room temperature by means of synchrotron-based X-ray powder diffraction in diamond anvil cells. Their bulk moduli increase with increasing osmium content and show a deviation from linearity. Bulk modulus of hcp-Ir0.20Os0.80 is identical to that of pure Os (411 GPa) within experimental errors. Peculiarities on fcc-Ir0.80Os0.20 compressibility curve indicate possible changes of its electronic properties at similar to 20 GPa. (C) 2014 Elsevier B.V. All rights reserved.

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