The initial stage of the hydriding of gadolinium metal at 100°C and sub-ambient pressure

Mordechai Brill, Itzhak Halevy, Giora Kimmel, Moshe H. Mintz, Joseph Bloch

Research output: Contribution to journalConference articlepeer-review

6 Scopus citations


The development of di- and trihydride phases on gadolinium metallic samples during the initial stage of the hydriding reaction at 100°C and under 0.5 atm of hydrogen was studied using combined microscopic examination, X-ray diffraction (XRD), and hydrogen absorption measurements. Samples were exposed to hydrogen for various times and the amount of hydrogen absorbed was measured. The reaction was then stopped and the samples were removed and examined microscopically to determine the degree of hydride development on the samples surfaces. XRD measurements were performed on the partially hydrided samples. The sequential formation of GdH 2 and GdH 3 was identified for the first time. The topochemical development of the hydride phases on gadolinium is discussed, based on the experimental results. It was found that following a short nucleation and growth of the dihydride phase, at a relatively early stage of the hydriding reaction, the trihydride is formed on top of the dihydride growing nuclei, so that when the hydride layer formation on the sample is completed, it is already constructed of both hydrides.

Original languageEnglish
Pages (from-to)93-98
Number of pages6
JournalJournal of Alloys and Compounds
StatePublished - 17 Jan 2002
EventProceedings of the International Symposium on Metal-Hydrogen (MH 2000) - Noosa Heads, QLD, Australia
Duration: 1 Oct 20006 Oct 2000


  • Dihydrides
  • Gadolinium
  • Hydride-forming metals
  • Rare-earth metals
  • Trihydrides
  • X-Ray diffraction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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