Abstract

The CsCl-type compounds CeAg x In1−x have a martensitic phase transformation with properties similar to that in LaAg x In1−x, but with higher transition temperature. For other trivalent lanthanides, the temperature for the transition into the tetragonal low temperature phase decreases with increasing atomic number. In the Jahn-Teller like model for the phase transformation, this can be related to the increasing distance of the 5d-levels from the Fermi energy.

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