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

Kirill V. Yusenko, Kristina Spektor, Saiana Khandarkhaeva, Timofey Fedotenko, Anna Pakhomova, Ilya Kupenko, Arno Rohrbach, Stephan Klemme, Wilson A. Crichton, Tatyana V. Dyachkova, Alexander P. Tyutyunnik, Yurii G. Zainulin, Leonid S. Dubrovinsky, Sergey A. Gromilov

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

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 β-trans-[Pt(NH3)2Cl2] and α-trans-[Pt(NH3)2Cl2] 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.

Original languageEnglish
Article number152121
Number of pages8
JournalJournal of Alloys and Compounds
Volume813
DOIs
Publication statusPublished - 15 Jan 2020

Keywords

  • Alloys
  • High-pressure high-temperature
  • Osmium
  • Phase diagrams
  • Platinum
  • Single-source precursors
  • THERMOLYSIS
  • STABILITY
  • RUTHENIUM
  • PARAMETERS
  • THERMAL-DECOMPOSITION
  • SOFTWARE
  • PHASE
  • X-RAY
  • BINARY-ALLOYS
  • EXTREME CONDITIONS

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