HYSTERESIS EFFECTS IN CERIUM-CONTAINING LaNi5-TYPE COMPOUNDS.

D. Dayan, M. H. Mintz, M. P. Dariel

Research output: Contribution to journalConference articlepeer-review

31 Scopus citations

Abstract

The (La//0//. //5Ce//0//. //5)Ni//5// minus //xCo//x-hydrogen system was studied using pressure-composition and X-ray diffraction techniques. The (La,Ce)Ni//5 compounds display very large hysteresis effects in the course of a hydrogenation cycle. The addition of cobalt markedly affects the absorption plateau pressure which reverts to normal values at x equals 1, practically eliminating the hysteresis effect. The results indicate that the elevated absorption plateau pressure and the resulting hysteresis effect are due to the presence of cerium atoms and to the formation of the expanded H**I LaNi//5-type hydride. The substitution of 20% of the nickel atoms by cobalt atoms suppresses the formation of the H**I hydride which is replaced by the less expanded H**I**I hydride. The H**I**I hydride does not display anomalous hysteresis effects.

Original languageEnglish
Pages (from-to)15-24
Number of pages10
JournalJournal of the Less-Common Metals
Volume73
Issue number1
DOIs
StatePublished - 1 Jan 1980
EventProc of the Int Symp on the Prop and Appl of Met Hydrides - Colorado Springs, CO, USA
Duration: 7 Apr 198011 Apr 1980

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