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Russian Journal of Inorganic Chemistry

, Volume 53, Issue 2, pp 323–326 | Cite as

Phase Equilibria in the Sc2S3-Ln2S3 (Ln = Dy, Er, or Tm) Systems

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

Abstract

Phase diagrams for the Sc2S3-Ln2S3 (Ln = Dy, Er, or Tm) systems were designed in the range from 1000 K to melting temperatures. The Ln3ScS6 compounds that are formed in these systems crystallize in monoclinic space group P21/m, and melt congruently: for Dy3ScS6, a = 1.118 nm, b = 1.262 nm, c = 0.354 nm, β = 94.7°, 1800 K, H = 2600 MPa; for Er3ScS6, a = 1.113 nm, b = 1.258 nm, c = 0.353 nm, β = 94.5°, 1830 K, H = 2800 MPa; for Tm3ScS6, a = 1.112 nm, b = 1.229 nm, c = 0.352 nm, β = 94.3°, 1835 K, H = 2940 MPa. The LnScS3 (Ln = Dy or Er) complex sulfides, with orthorhombic structures, space group Pnma, melt incongruently: for DyScS3, a = 0.700 nm, b = 0.637 nm, c = 0.943 nm, 1810 K, H = 3800 MPa; and for ErScS3, a = 0.697 nm, b = 0.633 nm, c = 0.942 nm, 1800 K, H = 3800 MPa. As the ionic radii rLn3+ and rSc3+ approach Ln Sc to each other in the row Dy-Er-Tm, the solubility in Sc2S3 increases, at 1670 K being equal to 13 mol % Dy2S3, 30 mol % Er2S3, and 40 mol % Tm2S3. LnScS3 (Ln = Dy or Er) forms a two-sided homogeneity region, at 1670 K lying in ranges of 43–56 mol % Ln2S3. The eutectic temperatures and compositions are as follows: 1700 K and 66 mol % Dy2S3, 1730 K and 81 mol % Dy2S3, 1740 K and 65 mol % Er2S3, 1700 K and 83 mol % Er2S3, 1730 K and 70 mol % Tm2S3, and 1755 K and 84 mol % Tm2S3.

Keywords

Unit Cell Parameter Erbium Thulium Metam Inorganic Crystal Structure Database 
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, Ltd. 2008

Authors and Affiliations

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

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