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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