Crystal structure of the Cu2CdSn3S8 compound

Phase relations in the Ag2S–CdS–SnS2 system and the crystal structure of the compounds

“…As a model for the refinement of the structure of compound II, the crystallographic parameters of rhodostannite (Cu 2 FeSn 3 S 8 , space group I4 1 /a, a = 0.7305, c = 1.0330 nm) [15] were taken at first. The Cu 2 CdSn 3 S 8 compound we discovered [16] crystallizes in this structure. A model of the Ag 2 FeSn 3 S 8 structure (space group Fd3m; a = 1.05723 nm) [17] that belongs to chalcospinel family was also considered.…”

“…The average interatomic distance M-S in the tetragonal version of the structure (0.262 nm) practically coincides with that of the cubic version. A quantitative estimate of the interatomic distance in the case of a statistical mixture (0.5Ag + + 0.25Cd 2+ + 0.25Sn 4+ ) or (0.25Cd 2+ + 0.75Sn 4+ ) calls for the use of a weighted average radius (WAR) [14,16] given as,…”

Phase relations in the quasi-binary Cu2GeS3–ZnS and quasi-ternary Cu2S–Zn(Cd)S–GeS2 systems and crystal structure of Cu2ZnGeS4

“…Two representatives of the 2-1-3-8 type were found in the Cu 2 S-Zn(Cd)S-SnS 2 systems [39,43]. The quaternary phase Cu 2 CdSn 3 S 8 [63] crystallizes in the rhodostannite structure (Cu 2 FeSn 3 S 8 , space group I4 1 /a) [64].…”

“…For compounds with VEC = 4, the coordination environment of some atoms differs from the tetrahedral, and the coordination number can vary from 2 (e.g. for Hg in the Ag 6 HgGeSe 6 structure [62]) to 6 (for the statistical mixture M (0.25Cd + 0.75Sn) in the structure of Cu 2 CdSn 3 S 8 [63]). The number of compounds on both sides from the 4-electron line drops down rapidly.…”

Phase equilibria in the Cu2S–ZnS–SnS2 system

“…Cu 2 ZnSn 3 S 8 forms in the section SnS 2 -B by the reaction SnS 2 + Cu 2 ZnSnS 4 ⇔ Cu 2 ZnSn 3 S 8 at 970 K. The quaternary compounds Cu 8 M 4 Sn 12 S 32 or Cu 2 MSn 3 S 8 where M is Fe, Ni, Co, Mn were already described in the literature [18]. They crystallize in a cubic structure, space group Fd3m, except rhodostannine Cu 2 FeSn 3 S 8 and a quaternary compound Cu 2 CdSn 3 S 8 which crystallize in a tetragonal structure, space group I4 1 /a with unit cell parameters a = 0.729 nm and c = 1.031 nm [19], a = 0.7305(2) nm and c = 1.0330(5) nm [20], a = 0.73827(4) nm and c = 1.04152(9) nm [21], respectively. The Cu 2 ZnSn 3 S 8 diffraction pattern is indexed with tetragonal structure and the lattice parameters a = 0.5435(1) nm, c = 1.0825(6) nm.…”