Crystal Structures of α- and β-SrCeCuS3

Resumo

The crystal structure of SrCeCuS₃, a complex sulfide synthesized for the first time, has been solved using X-ray powder diffraction data. The crystals are orthorhombic, space group Pnma. SrCeCuS₃ has two polymorphs: the high-temperature phase of Ba₂MnS₃ structural type (a = 8.1393(3) Å, b = 4.0587(2) Å, c = 15.9661(2) Å) and the low-temperature phase isostructural to BaLaCuS₃ (a = 11.1626(2) Å, b = 4.0970(2) Å, c = 11.5307(1) Å). The incongruent melting temperature and enthalpy of SrCeCuS₃ are, respectively, 1486 ± 3 K and 13.4 ± 1.5 J/g.