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.
R. W. Schwartz, S. F. Watkins, C. J. O'Connor and R. L. Carlin, J. Chem. Soc., Faraday Trans. 2, 1976, 72, 565 DOI: 10.1039/F29767200565
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