Abstract
Structure solution has been carried out for newly synthesized compounds SrLnCuS3 (Ln = Pr, Sm, Dy, or Er). These sulfides have orthorhombic structures of the following types: SrPrCuS3 crystallizes in a BaLaCuS3-type structure, space group Pnma; SrLnCuS3 (Ln = Sm or Dy) crystallize in an Eu2CuS3-type structure, space group Pnma; and SrErCuS3, in a KZrCuS3-type structure, space group Cmcm. In studies of the SrS-Cu2S-Ln2S3 (Ln = Gd or Er) systems, the following tie-lines at 1050 K were located: SrLnCuS3-SrLn2S4, SrLnCuS3-SrS, SrLnCuS3-CuLnS2, Cu2S-SrLnCuS3, SrLnCuS3-solid solution C0 of the Cu2S-Gd2S3 (β-Cu3ErS3) system, and Ln2S3-SrLnCuS3. In the series of the SrS-Cu2S-Ln2S3 (Ln = La-Lu) systems, two tendencies are observed: monotony (decrease in the unit cell parameters and volumes and increase in the melting temperatures of SrLnCuS3 compounds in the ranges La-Nd and Sm-Lu) and periodicity (two types of triangulation of the SrS-Cu2S-Ln2S3 system, three structure types, and different space groups of SrLnCuS3 compounds; jump in the melting temperatures of the SrLnCuS3 compounds in the range Nd-Sm).
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