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short communications
From well resolved Guinier powder diagrams the space group of potassium hexachlorotellurate is shown to be P21/n (No. 14). At room temperature the lattice parameters are a = 7.165 (1), b = 7.175 (1), c = 10.189 (1) Å and β = 90.24 (1)°. No phase transition occurs upon cooling the compound down to 130±10 K where a = 7.062 (1), b = 7.206 (1), c = 10.040 (2) Å and β = 90.61 (1)°. It appears however that at 323±5 K the powder pattern of monoclinic K2TeCl6 has already merged into that of the cubic phase [space group Fm3m, a = 10.189 (1) Å].