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|Title:||Homogeneity Range and Order-Disorder Transitions in R1-xNi2 Laves Phase Compounds|
|Authors:||PAUL-BONCOUR V.; LINDBAUM A.; LATROCHE M.; HEATHMAN STEPHEN|
|Citation:||INTERMETALLICS vol. 14 p. 483-490|
|Type:||Articles in periodicals and books|
|Abstract:||The range of homogeneity has been studied in R1-xNi2 Laves phases (R=Ce, Gd, Tb) by x ray diffraction, microprobe analysis and density measurements. In these compounds the number of R vacancies varies as a function of the nature of the rare earth and the nominal composition. For R=Tb the number of vacancies varies by 0 £ x £ 0.5, 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 versus temperature for all the -xNi2 compounds. The evolution of the pressure and temperature transition, which reflects the binding energy of the vacancies, depends not only on the radius of the R element but also on the mass of the R atom.|
|JRC Directorate:||Nuclear Safety and Security|
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