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Russian Journal of Inorganic Chemistry

, Volume 52, Issue 7, pp 1161–1164 | Cite as

Phase diagrams of the systems Sc2S3-Ln2S3 for Ln = La, Nd, or Gd

  • O. V. Andreev
  • O. Yu. Mitroshin
  • I. A. Razumkova
Physicochemical Analysis of Inorganic Systems

Abstract

Phase diagrams have been designed for the systems Sc2S3-Ln2S3 where Ln = La, Nd, or Gd. In these systems, complex sulfides crystallize in orthorhombic space group Pnma. The sulfides melt congruently and have the following parameters; for LaScS3, a = 0.718 nm, b = 0.654 nm, c = 0.960 nm, 2000 K, 3200 MPa; for NdScS3, a = 0.712 nm, b = 0.646 nm, c = 0.952 nm, 1960 K, 3500 MPa; and for GdScS3, a = 0.704 nm, b = 0.640 nm, c = 0.946 nm, 1900 K, 3400 MPa. The extents of the solid solutions based on the existing phases increase as the effective ion radii of Ln3+ approaches that of Sc3+. At 1670 K, the LnScS3 homogeneity region is 48–52 mol % Nd2S3 and 46–54 mol % Gd2S3. Sc2S3 dissolves 3 mol % Nd2S3 and 6 mol % Gd2S3. γ-Nd2S3 dissolves 2 mol % Sc2S3, and γ-Gd2S3 dissolves 4 mol % Sc2S3. The subsystems Sc2S3-LnScS3 and LnScS3-Ln2S3 are of the eutectic type. The eutectic coordinates are, respectively, 27 mol % La2S3, 1880 K; 75 mol % La2S3, 1800 K; 30 mol % Nd2S3, 1850 K; 74 mol % Nd2S3, 1770 K; 33 mol % Gd2S3, 1800 K; and 74 mol % Gd2S3, 1730 K.

Keywords

Unit Cell Parameter Scandium Homogeneity Region Orthorhombic Space Group Sulfur Vapor 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Pleiades Publishing, Inc. 2007

Authors and Affiliations

  • O. V. Andreev
    • 1
  • O. Yu. Mitroshin
    • 1
  • I. A. Razumkova
    • 1
  1. 1.Tyumen State UniversityTyumenRussia

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