Abstract
Complex sulfides with the SrS: Ln2S3 ratio equal to 3: 1, 1: 3, or 1: 4 for Ln = Y or Lu have been predicted on the basis of thermodynamic analysis of previously designed SrS-Ln2S3 (Ln = Tb, Dy, or Er) phase diagrams. Phase diagrams for the SrS-Ln2S3 (Ln = Tm, Lu, or Sc) systems have been designed for the first time. These systems form congruently melting compounds SrLn2S4 (CaFe2O4 type structure, orthorhombic crystal system). Unit cell parameters, heats of melting, and microhardnesses have been determined. For SrTm2S4, the respective values are as follows: a = 1.181 nm, b = 1.421 nm, c = 0.396 nm, 2040 K, ΔH m = 188 kJ/mol, 3500 MPa; for SrLu2S4: a = 1.187 nm, b = 1.416 nm, c = 0.392 nm, 2070 K, ΔH m = 190 kJ/mol, 3540 MPa; and for SrSc2S4: a = 1.180 nm, b = 1.410 nm, c = 0.390 nm, 2100 K, ΔH m = 206 kJ/mol, 3650 MPa. The increase in the melting temperatures and the heats of melting calculated for the SrLn2S4 compounds correlate with their classification as thio salts.
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Andreev, O.V., Mitroshin, O.Y., Khritokhin, N.A. et al. Phase Equilibria Laws in the SrS-Ln2S3 (Ln = Yb-Lu, Y, or Sc) Systems. Russ. J. Inorg. Chem. 53, 440–445 (2008). https://doi.org/10.1134/S0036023608030182
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DOI: https://doi.org/10.1134/S0036023608030182