Crystal structure and properties of AHoCuS3 (A = Sr or Eu)

The structures of complex sulfides AHoCuS 3 (A = Sr or Eu) have been determined by X-ray powder diffraction. The crystals of the compounds belong to the orthorhombic crystal system; they are isostructural (space group, Pnma ; structure type Eu 2 CuS 3 ). The unit cell parameters for SrHoCuS 3 and EuHoCuS 3 are a = 10.1487(1) Å, b = 3.9332(1) Å, c = 12.9524(2) Å and a = 10.1484(2) Å, b = 3.9195(1) Å, c = 12.8499(2) Å, respectively. The temperatures and enthalpies of phase transformations of complex sulfides AHoCuS 3 (A = Sr or Eu) have been determined.