Homogeneity range and order-disorder transitions in R1-xNi 2 Laves phase compounds

V. Paul-Boncour, A. Lindbaum, M. Latroche, S. Heathman

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

The homogeneity range of R1-xNi2 Laves phases (R=Ce, Gd, Tb) has been studied by X-ray diffraction, microprobe analysis and density measurements. In these compounds, the number of R vacancies varies as a function of the atomic number of the rare earth metal and the nominal composition. For R=Tb the number of vacancies varies by 0≤x≤0.5, with a change of the structure from a pure C15 structure to a 2a superstructure accompanied by a cell volume decrease. The order-disorder transition of the rare-earth vacancies has been studied under applied pressure for La7Ni16 and as a function of temperature for all the R1-xNi2 compounds. The evolution of the transition pressure and temperature, which reflects the binding energy of the vacancies in the lattice, depends not only on the radius of the R atoms but also on their masses.

Original languageEnglish
Pages (from-to)483-490
Number of pages8
JournalIntermetallics
Volume14
Issue number5
DOIs
Publication statusPublished - May 2006
Externally publishedYes

Keywords

  • A. Laves phases
  • D. Defects: constitutional vacancies
  • F. Calorimetry
  • F. Diffraction
  • F. Metallographic techniques

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