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High-pressure high-temperature stability of hcp-IrxOs1−x (x = 0.50 and 0.55) alloys

Kirill Yusenko, Elena Bykova, Maxim Bykov, Sergey A. Gromilov, Alexander V. Kurnosov, Clemens Prescher, Vitali B. Prakapenka, Wilson A. Crichton, Michael Hanfland, Serena Margadonna Orcid Logo, Leonid S. Dubrovinsky

Journal of Alloys and Compounds, Volume: 700, Pages: 198 - 207

Swansea University Authors: Kirill Yusenko, Serena Margadonna Orcid Logo

Abstract

An in situ powder X-ray diffraction has been used for a monitoring a formation of hcp-Ir0.55Os0.45 alloy from (NH4)2[Ir0.55Os0.45Cl6] precursor. A crystalline intermediate compound and nanodimentional metallic particles with a large concentration of defects has been found as key intermediates in the...

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Published in: Journal of Alloys and Compounds
ISSN: 0925-8388
Published: 2017
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa31566
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Abstract: An in situ powder X-ray diffraction has been used for a monitoring a formation of hcp-Ir0.55Os0.45 alloy from (NH4)2[Ir0.55Os0.45Cl6] precursor. A crystalline intermediate compound and nanodimentional metallic particles with a large concentration of defects has been found as key intermediates in the thermal decomposition process in hydrogen flow. High-temperature stability of titled hcp-structured alloys has been investigated upon compression up to 11 GPa using a multi-anvil press and up to 80 GPa using laser-heated diamond-anvil cells to obtain a phase separation into fcc + hcp mixture. Obtained high-pressure high-temperature data allowed us to construct the first model for pressure-dependent Ir─Os phase diagram.
Keywords: High-pressure; High-temperature; Alloys; Iridium; Osmium
College: College of Engineering
Start Page: 198
End Page: 207