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1 Polish Journal of Chemistry

1 2008

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Investigation of the Sc2Se3-Cu2Se-SnSe2 and Sc2Se3-Cu2Se-PbSe Systems at 870 K

Gulay L. D., Daszkiewicz M., Shemet V. Y., Pietraszko A.

Polish Journal of Chemistry

2008

Vol. 82, nr 5

1001-1014

Phase equilibria in the Sc2Se3-Cu2Se-SnSe2 and Sc2Se3-Cu2Se-PbSe sys tems at 870 K were determined using X-ray powder diffraction. The crystal structure of the ScCuSe2 (space group C2/m, a = 1.2762(3) nm, b = 0.7752(1) nm, c = 0.9260(1) nm, beta =133.32(2)°, R1 = 0.0396, wR2 = 0.1141) of the Sc2Se3-Cu2Se section was re investigated using X-ray single crystal diffraction. No compound exists in the Sc2Se3-SnSe2 section. The formation of the Cu2SnSe3 (Cu2GeS3 structure type, space group Cc) in the Cu2Se-SnSe2 sec tion was confirmed. The Sc2PbSe4 (CaFe2O4 structure type, space group Pnma) ex ists in the Sc2Se3-PbSe sec tion. No compound exists in the Cu2Se-PbSe section. The existence of the Sc0.96-1.18Cu0.37Sn1.19-1.02Se4 (Yb1.84Fe1.23S4 structure type, space group Fd3m, a = 1.0822-1.0935(2) nm) solid solution was established in the Sc2Se3-Cu2Se-SnSe2 sys tem. No quaternary compound exists in the Sc2Se3-Cu2Se-PbSe system.