Thermal analysis of hydrogen-induced amorphization in C15 Laves RFe 2 compounds

M. Dilixiati, K. Kanda, K. Ishikawa, K. Suzuki, K. Aoki

Research output: Contribution to journalConference articleOther

12 Citations (Scopus)

Abstract

Structural changes of C15 Laves RFe 2 (R=Y, Ce, Sm, Gd, Tb, Dy, Ho and Er) compounds during thermal analysis in an H 2 atmosphere were investigated by scanning differential calorimetry (DSC), powder X-ray diffraction (XRD) and hydrogen analysis. Hydrogen absorption, hydrogen-induced amorphization (HIA), precipitation of RH 2 and crystallization of an amorphous phase occurred with increasing temperature for R=Y, Sm, Gd, Tb, Dy and Ho. Hydrogen absorption and HIA occurred simultaneously for R=Ce, while HIA and precipitation of ErH 2 occurred simultaneously for R=Er. The enthalpy change ΔH and the activation energy ΔE for thermal reactions of RFe 2 during heating in a hydrogen atmosphere were evaluated by DSC.

Original languageEnglish
Pages (from-to)743-746
Number of pages4
JournalJournal of Alloys and Compounds
Volume330-332
DOIs
Publication statusPublished - 17 Jan 2002
Externally publishedYes
EventProceedings of the International Symposium on Metal-Hydrogen (MH 2000) - Noosa Heads, QLD, Australia
Duration: 1 Oct 20006 Oct 2000

Keywords

  • Activation energy
  • Amorphous
  • C15 Laves phase
  • Hydrogen
  • Rare earth metal

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