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A series of rare-earth metal disulfides  Ln S 2  and diselenides  Ln Se 2  ( Ln  = Sm, Gd, Tb, Dy, Ho, Er and Tm has been prepared by high-pressure high-temperature synthesis at 8(1) GPa. The dichalcogenides  LnX  2  ( X  = S, Se) are found to crystallize in the  α -LaS 2  type with the monoclinic space group  P 12 1 / a 1 (no. 14). The crystal structure is a twofold superstructure of the ZrSSi aristotype and consists of puckered cationic [ LnX ] +  double slabs which are sandwiched by planar chalcogen sheets containing  X  2  2–  dumbbells.

High-pressure synthesis of rare-earth metal disulfidesand diselenides LnX 2 ( Ln = Sm, Gd, Tb, Dy, Ho, Er and Tm; X = S, Se)