Decomposition of single-source precursors under high-temperature high-pressure to access osmium-platinum refractory alloys

JOURNAL OF ALLOYS AND COMPOUNDS

卷:813

Article

Yusenko, Kirill, V¹  Spektor, Kristina²  Khandarkhaeva, Saiana³  Fedotenko, Timofey⁴  Pakhomova, Anna⁵  Kupenko, Ilya⁶  Rohrbach, Arno⁶  Klemme, Stephan⁶  Crichton, Wilson A.²  Dyachkova, Tatyana, V⁷  Tyutyunnik, Alexander P.⁷  Zainulin, Yurii G.⁷  Dubrovinsky, Leonid S.³  Gromilov, Sergey A.^8,9 

[1] BAM Fed Inst Mat Res & Testing, Richard Willstatter Str 11, D-12489 Berlin, Germany

[2] ESRF European Synchrotron, 71 Ave Martyrs, F-38000 Grenoble, France

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

[4] Univ Bayreuth, Lab Crystallog, Mat Phys & Technol Extreme Condit, D-95440 Bayreuth, Germany

[5] DESY, Photon Sci, Notkestr 85, D-22607 Hamburg, Germany

[6] Westfalische Wilhelms Univ Munster, Inst Mineral, Corrensstr 24, D-48149 Munster, Germany

[7] Inst Solid State Chem, Pervomaiskaia Str 91, Ekaterinburg 620990, Russia

[8] Nikolaev Inst Inorgan Chem, Lavrentiev Ave 3, Novosibirsk 630090, Russia

[9] Novosibirsk State Univ, Pirogova Str 2, Novosibirsk 630090, Russia

关键词: Osmium;    Platinum;    Alloys;    Phase diagrams;    Single-source precursors;    High-pressure high-temperature;   

DOI  :  10.1016/j.jallcom.2019.152121

来源: Elsevier

【 摘 要 】

Thermal decomposition of (NH4)(2)[OsxPt1-xCl6] as single-source precursors for Os-Pt binary alloys has been investigated under ambient and high pressure up to 40 GPa. Thermal decomposition of mixed-metal (NH4)(2)[OsxPt1-xCl6] precursors in hydrogen atmosphere (reductive environment) under ambient pressure results in formation of beta-trans-[Pt(NH3)(2)Cl-2] and alpha-trans-[Pt(NH3)(2)Cl-2] crystalline intermediates as well as single and two-phase Os-Pt binary alloys. For the first time, direct thermal decomposition of coordination compound under pressure has been investigated. A formation of pure metallic alloys from single-source precursors under pressure has been shown. Miscibility between fcc- and hcp-structured alloys has been probed up to 50 GPa by in situ high-pressure X-ray diffraction. Miscibility gap between fcc- and hcp-structured alloys does not change its positions with pressure up to at least 50 GPa. (C) 2019 Elsevier B.V. All rights reserved.

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