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MnS-Ln2S3 (Ln = La, Nd, or Gd) phase diagrams; thermodynamics of phase transitions

  • Physicochemical Analysis of Inorganic Systems
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Abstract

The MnS-La2S3 phase diagram has been constructed where the incongruently melting compound Mn2La6S11 is formed. Complex sulfide Mn2La6S11 is characterized by monoclinic structure; its incongruent melting temperature is 1535 K. Eutectic coordinates are 31 mol % La2S3, 1490 K. The extent of the γ-La2S3 based solid solutions at 1570 K is 8 mol % MnS; at 770 K, α-La2S3 dissolves 3 mol % MnS. The MnS-Gd2S3 system is a eutectic with limited solid solutions. Eutectic coordinates are 35.5 mol % Gd2S3, 1640 K. Solubility in Γ-Gd2S3 is 28 mol % MnS at 1570 K, in α-Gd2S3 is 13 mol % MnS at 1170 K, and in MnS is 1 mol % Gd2S3. Thermochemical equations have been composed for eutectic and eutectoid phase transformations. A MnS-Nd2S3 phase diagram has been predicted.

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Authors and Affiliations

  1. Tyumen State University, Tyumen, Russia

    O. V. Andreev & L. N. Monina

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  1. O. V. Andreev
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  2. L. N. Monina
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Original Russian Text © O.V. Andreev, L.N. Monina, 2012, published in Zhurnal Neorganicheskoi Khimii, 2012, Vol. 57, No. 10, pp. 1479–1483.

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Andreev, O.V., Monina, L.N. MnS-Ln2S3 (Ln = La, Nd, or Gd) phase diagrams; thermodynamics of phase transitions. Russ. J. Inorg. Chem. 57, 1393–1397 (2012). https://doi.org/10.1134/S0036023612100026

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  • DOI: https://doi.org/10.1134/S0036023612100026

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