Abstract
For estimating the boundaries of the homogeneity field of silver thiogallate (TGS) in the quasibinary system Ag2S-Ga2S3, the oriented crystallization of three samples of the following composition (at %) was made: (1) 42.86 Ag, 14.28 Ga, 42.86 S; (2) 26.26 Ag, 24.24 Ga, 49.49 S; (3) 23.76 Ag, 25.74 Ga, 50.49 S. It was shown that the trajectories of changes in the melt composition upon crystallization on the surface of the liquidus of the system Ag-Ga-S do not lie in the plane of the section Ag2S-Ga2S3. This means that the section is not quasi-binary. Our data and literature data say that the projection of the field of homogeneity of TGS onto the concentration triangle has a fairly wide interval in sulfur (from 49.5 to 51.2 at %) and less wide interval in metallic components. The sizes of the field of homogeneity of TGS decrease, while temperature fall and its boundaries come to a stoichiometric composition. This circumstance can lead to the formation of inclusions of minor phases during crystal cooling. The character of inclusions is indicated by the belonging of the melt composition to different segments of triangulation of phase diagram Ag-Ga-S.
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