Directional solidification of xAg2S(1−x)Ga2S3 Melts and the proof of the non-quasi-binary character of the Ag2S-Ga2S3 join

We report the results of directional solidification of three samples whose compositions belong to the Ag2S-Ga2S3 system. This system was reported to be a quasi-binary join of the Ag-Ga-S ternary system. By our data, the trajectories of melt and solid compositions do not lie in the plane of this join. It follows from this that the Ag2S-Ga2S3 join is not quasi-binary.