Pressure–temperature phase diagram of Ta-H system up to 9 GPa and 600 C

Hiroyuki Saitoh, Shigeyuki Takagi, Toyoto Sato, Shin Ichi Orimo

Research output: Contribution to journalArticlepeer-review

Abstract

High-pressure hydrogenation behaviors of pure metals have not been investigated exten-sively, although intense research of hydrogenation reactions under high pressure has been conducted to find novel functional hydrides. The former provides us with valuable information for the high-pressure synthesis of novel functional hydrides. A pressure–temperature phase diagram of the Ta–H system has been determined using the in situ synchrotron radiation X-ray diffraction technique below 9 GPa and 600 C in this study. At room temperature, the phase boundary obtained between distorted bcc TaH~1 and hcp TaH~2 was consistent with the previously reported transition pressure. The experimentally obtained Clapeyron slope can be explained via the entropy change caused by hydrogen evolution from TaH~2.

Original languageEnglish
Article number6719
JournalApplied Sciences (Switzerland)
Volume11
Issue number15
DOIs
Publication statusPublished - 2021 Aug 1

Keywords

  • High pressure and high temperature
  • Phase diagram
  • Synchrotron radiation X-rays
  • Tantalum
  • Tantalum dihydride
  • Tantalum hydride
  • Ta–H

ASJC Scopus subject areas

  • Materials Science(all)
  • Instrumentation
  • Engineering(all)
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes

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