Abstract: | The interactions in the GeS2-Cr2S3 and Cu2GeS3-Cr2S3 sections were studied by differential thermal analysis and X-ray powder diffraction. The GeS2-Cr2S3 section was shown to be quasi-binary, with a degenerate eutectic; no ternary compound was formed. In the Cu2GeS3-Cr2S3 section, a quaternary phase of variable composition having a homogeneity range of 69–75 mol % Cr2S3 crystallized in the cubic system. The samples of this composition are spin glasses with freezing temperatures of 20–25 K. |