A crystalline phase transition has been observed between room temperature and 77 K in certain members of the series Cs2NaLnCl6(Ln = lanthanide ion). Optical spectroscopy and e.p.r. results are used to define the possible low temperature space groups. The possibility that an order-disorder transformation involving the caesium ions as the cause of this transition is discussed.
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Schwartz et al. (1976) studied this question.