Synthesis and properties of platinum hydride

Thomas Scheler, Olga Degtyareva, Miriam Marques, Christophe L. Guillaume, John E. Proctor, Shaun Evans, Eugene Gregoryanz

Research output: Contribution to journalArticlepeer-review

Abstract

Synchrotron x-ray diffraction experiments on compressed platinum-hydrogen mixtures reveal the formation of platinum hydride at a pressure of 27(1) GPa at room temperature. This compound exhibits two phases, PtH-I and PtH-II, coexisting up to the pressure of 42 GPa, above which the single phase of PtH-II is observed. Pt atoms in the PtH-II phase are shown to form a hexagonal closed-packed structure. This phase exhibits a high bulk modulus of 310 (10) GPa and is stable up to at least 53 GPa. Ab initio calculations show that PtH-II is superconducting with T(c) = 12 K at 90 GPa, the highest temperature of superconducting transition among any known metal hydride.

Original languageEnglish
Article number214106
Number of pages5
JournalPhysical review B: Condensed matter and materials physics
Volume83
Issue number21
DOIs
Publication statusPublished - 9 Jun 2011

Keywords

  • HIGH-PRESSURE
  • METAL-HYDRIDES
  • HYDROGEN
  • SUPERCONDUCTIVITY
  • TEMPERATURE
  • STATE
  • NITRIDES
  • EQUATION
  • CRYSTAL
  • SYSTEMS

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