Crystal structure of the R3Ag1-δSiS7 (R = La, Ce, Pr, Nd, Sm, δ = 0.10-0.23) compounds

The crystal structure of the R3Ag1-δSiS7 (R = La, Ce, Pr, Nd, Sm, δ = 0.10-0.23, space group P63, Pearson symbol hP23.80 - 23.54) compounds were determined by means of X-ray single crystal diffraction (a = 1.04168(8) nm, c = 0.57825(4) nm, R1 = 0.0116 for La3Ag0.90SiS7; a = 1.0312(1) nm, c = 0.57395(7) nm, R1 = 0.0152 for Ce3Ag0.82SiS7; a = 1.0248(1) nm, c = 0.57223(5) nm, R1 = 0.0105 for Pr3Ag0.85SiS7; a = 1.0192(1) nm, c = 0.57020(6) nm, R1 = 0.0292 for Nd3Ag0.81SiS7, a = 1.0100(1) nm, c = 0.56643(6) nm, R1 = 0.0208 for Sm3Ag0.77SiS7. Gradual decrease of the silver amount in the series of chalcogenides was found