Compressibility of Ir–Os alloys under high pressure

Titelangaben

Yusenko, Kirill V. ; Bykova, Elena ; Bykov, Maxim ; Gromilov, Sergey A. ; Kurnosov, Alexander ; Prescher, Clemens ; Prakapenka, Vitali B. ; Hanfland, Michael ; van Smaalen, Sander ; Margadonna, Serena ; Dubrovinsky, Leonid:
Compressibility of Ir–Os alloys under high pressure.
In: Journal of Alloys and Compounds. Bd. 622 (2015) . - S. 155-161.
ISSN 0925-8388
DOI: https://doi.org/10.1016/j.jallcom.2014.09.210

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Abstract

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 ∼20 GPa.