Pressure induced disordering of vacancies in RNi2 compounds

A. Lindbaum, S. Heathman, E. Gratz

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3 Citations (Scopus)


As known from earlier investigations, most of the RNi2 compounds (R. . .rare earth element) do not crystallize in the cubic Laves phase structure (C15), but in a superstructure of C15 with ordered vacancies at the R sites. In the present work high pressure X-ray diffraction experiments on selected RNi2 compounds (R = Tb, Sm, Gd and Y) are presented, showing that pressures of about 8-15 GPa lead to a disordering of the vacancies in all of them. Furthermore the studies show that the pressure-induced order-disorder transition is closely related to the earlier observed disordering of the vacancies at high temperatures between 430 K (TbNi2) and 740 K (YNi2), and that there is a pronounced variation of the transition pressures and temperatures among the investigated compounds.

Original languageEnglish
Pages (from-to)411-414
Number of pages4
JournalHigh Pressure Research
Issue number2
Publication statusPublished - May 2002
Externally publishedYes


  • Diamond anvil cell
  • Order-disorder transition
  • Superstructure
  • Synchrotron radiation
  • Vacancies


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