Some iodo elpasolites Cs 2 LiM III I 6 (M III = Sc, Lu, Tm, Ho) and Cs 2 NaM III I 6 (M III = Sc, Lu, Tm, Er) have been prepared for the first time. According to Guinier-Simon X-ray powder photographs they belong to the elpasolite type structure (cubic K 2 NaAlF 6 -type and its tetragonal distorted variety: Cs 2 NaMI 6 ) or to the Cs 2 LiGaF 6 -type structure (trigonal: Cs 2 LiMI 6 ). The compounds Cs 2 LiTmX 6 (X = CI, Br, I) are further characterized by Raman spectra and magnetic susceptibilities.
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Gerd Meyer (1980) studied this question.