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Phase equilibria in the Cu2S–La2S3–EuS system

  • Physicochemical Analysis of Inorganic Systems
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Abstract

Phase equilibria in the isothermal (970 K) and polythermal LaCuS2–EuS, Cu2S–EuLaCuS3, LaCuS2–EuLa2S4, and EuLaCuS3–EuLa2S4 sections of the Cu2S–La2S3–EuS system have been studied. EuLaCuS3 (annealing at 1170 K) is of orthorhombic system, space group Pnma, a = 8.1366(1) Å, b = 4.0586(1) Å, c = 15.9822(2) Å, is isostructural to Ba2MnS3, and incongruently melts by the reaction EuLaCuS3cryst (0.50 EuS; 0.50 LaCuS2) ↔ 0.22 EuS SS (0.89 EuS; 0.11 LaCuS2) + 0.78 liq (0.39 EuS; 0.61 LaCuS2); ΔН = 52 J/g. The Cu2S–La2S3–EuS system has been found to contain five major subordinate triangles. At 970 K, tie-lines lie between EuLaCuS3 and the Cu2S, EuS, LaCuS2, and EuLa2S4 phases and between the LaCuS2 phase and the γ-La2S3–EuLa2S4 solid solution. Eutectics are formed between LaCuS2 and EuLaCuS3 at 26.0 mol % of EuS and T = 1373 K and between EuLaCuS3 and EuLa2S4 at 29.0 mol % of EuLa2S4 and T = 1533 K.

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Authors and Affiliations

  1. Tyumen State University, ul. Volodarskogo 6, Tyumen, 625003, Russia

    A. V. Ruseikina & O. V. Andreev

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  1. A. V. Ruseikina
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  2. O. V. Andreev
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Correspondence to A. V. Ruseikina.

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Original Russian Text © A.V. Ruseikina, O.V. Andreev, 2017, published in Zhurnal Neorganicheskoi Khimii, 2017, Vol. 62, No. 5, pp. 611–619.

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Ruseikina, A.V., Andreev, O.V. Phase equilibria in the Cu2S–La2S3–EuS system. Russ. J. Inorg. Chem. 62, 610–618 (2017). https://doi.org/10.1134/S0036023617050199

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