Oxidation induced cubic-tetragonal phase transformation in titanium hydride powders

R. Ben David, Y. Finkelstein, E. Grinberg, S. Samuha, E. Rabkin, D. Cohen

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We studied the effect of oxidation temperature and initial hydrogen concentration on the occurrence of cubic (δ) to tetragonal (ε) phase transformation induced by thermal oxidation of titanium hydride powders in air. X-ray diffraction analysis indicates that δ → ε transformation occurs during oxidation at 400 °C, but not at lower (300 °C) or higher (500 °C) oxidation temperatures. The relative amounts of hydrogen loss during oxidation were determined by temperature-programmed desorption mass spectrometry (TPD-MS). The findings suggest that oxygen stabilizes the tetragonal phase (ε), and that the δ/ε phase composition following oxidation depends on both oxygen and hydrogen concentrations. For high oxidation temperatures (500 °C), some degree of hydride decomposition leads to a decrease in H concentration and to destabilization of the tetragonal phase after cooling down to room temperature.

Original languageEnglish
Pages (from-to)25043-25053
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume45
Issue number46
DOIs
StatePublished - 21 Sep 2020
Externally publishedYes

Keywords

  • Mass spectrometry (TPD-MS)
  • Oxidation
  • Phase transformation
  • Temperature programmed desorption
  • Titanium hydride (TiH)
  • X-ray diffraction

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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