The alloys of the Cu 2 CdSnSe 4 -Cu 2 MnSnSe 4 system were investigated using the X-ray powder method that showed the continuous solubility of the original system components at 670 K. The refinement of the crystal structures of Cu 2 MnSnSe 4 (space group (SG) I4 2m, a = 0.57362(4) nm, c = 1.14007(7) nm, c/a = 1.9875, R I = 0.0531, R P = 0.1186) and of the solid solution of Cu 2 Cd 0.5 Mn 0.5 SnSe 4 composition (SG I4 2m, a = 0.57935(2) nm, c = 1.14036(5) nm, c/a = 1.9683, R I = 0.0455, R P = 0.0902) was performed. It was established that Cd mixes statistically with Mn in its crystallographic position.The crystal structure of the Cu 2 MnSnSe 4 compound and of the solid solution of Cu 2 Cd 0.5 Mn 0.5 SnSe 4 composition are studied in detail in this paper. These isostructural phases are described in the stannite structural type (SG I42m (no. 121)) with the lattice parameters a = 0.57362(4) nm, c = 1.14007(7) nm and a = 0.57935(2) nm, c = 1.14036(5) nm, respectively. Atomic parameters were calculated in the isotropic approximation (R I = 0.0531 and R I = 0.0455 for Cu 2 MnSnSe 4 and Cu 2 Cd 0.5 Mn 0.5 SnSe 4 , respectively). The initial quaternary compounds form a continuous solid-solution series.

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Phase diagrams of the AgGaSe2–SiSe2 system were explored by differential thermal analysis (DTA) and X-ray diffraction (XRD) analysis methods for the first time.