Abstract
The Cr 3± x Se 4 shows an order-disorder transition from the monoclinic Cr 3Se 4 type to the CdI 2-type structure. This transition originates in the intralayer disordering of metal vacancies in the alternate partially filled metal layers along the c axis. The transition is reversible and of first order. The transition temperature vs composition curve has a maximum (∼900°C) at a stoichiometric composition of Cr 3Se 4. A statistical treatment of this phenomenon was attempted via the Bragg-Williams approximation.
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