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Ho2S3-Ga2S3 phase diagram

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Abstract

The Ho2S3-Ga2S3 system has been studied using differential thermal analysis, X-ray diffraction, microstructural analysis, microhardness tests, and density measurements, and its phase diagram has been constructed. The system contains three ternary compounds: Ho3GaS6, HoGaS3, and Ho6Ga10/3S14. Their melting behavior has been studied for the first time. The compound Ho6Ga10/3S14 melts congruently at 1435 K; Ho3GaS6 and HoGaS3 melt incongruently at 1370 and 1250 K, respectively. The Ho2S3-Ga2S3 system is a pseudobinary join of the ternary system Ho-Ga-S. At room temperature, the β-Ga2S3-based solid solution extends to 1.5 mol % Ho2S3; the Ho2S3 solubility in γ-Ga2S3 is 10 mol %. The compounds HoGaS3 and Ho3GaS6 crystallize in orthorhombic symmetry (Ho3GaS6: a = 10.40 Å, b = 13.20 Å, c = 6.44 Å, Z = 4; HoGaS3: a = 6.8 Å, b = 9.92 Å, a = 3.08 Å, Z = 4). Ho6Ga10/3S14 has a hexagonal structure (a = 9.62 Å, c = 6.04 Å).

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  1. Faculty of Arts and Sciences, Adiyaman University, Adiyaman, 02040, Turkey

    C. A. Veliev

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  1. C. A. Veliev
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Correspondence to C. A. Veliev.

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Original Russian Text © C.A. Veliev, 2010, published in Neorganicheskie Materialy, 2010, Vol. 46, No. 5, pp. 520–523.

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Veliev, C.A. Ho2S3-Ga2S3 phase diagram. Inorg Mater 46, 452–455 (2010). https://doi.org/10.1134/S002016851005002X

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