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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; Leonid S. Dubrovinsky

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

Swansea University Authors: Kirill, Yusenko, Serena, Margadonna

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