Abstract
The crystal-chemical characteristics of new complex sulfides SrLnCuS3 (Ln = Gd, Lu) are determined from the data of X-ray powder diffraction patterns. SrGdCuS3 crystallizes in the orthorhombic crystal system (space group Pnma) and belongs to the Eu2CuS3 structure type with the unit cell parameters a = 10.3282(8) A, b = 3.9624(2) A, and c = 12.9364(9) A. The structure of SrLuCuS3 is orthorhombic: the KZrCuS3 structure type, space group Cmcm, and unit cell parameters are a = 3.9105(2) A, b = 12.9419(9) A, and c = 10.0191(8) A. A substantial role of crystal-chemical contraction inside the [LnCuS3] dimeric block in the stabilization of structure types based on Eu2CuS3 and KZrCuS3 is shown.
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