Ag3Ge2S5Br: Synthesis, structure and ionic conductivity (original) (raw)

Chemistry of Metals and Alloys

A new compound, Ag 3 Ge 2 S 5 Br, was found on the intersection of the Ag 3 SBr-GeS 2 and Ag 2 Ge 2 S 5-AgBr polythermal cross-sections of the Ag 2 S-GeS 2-AgBr system. The peritectic process L + GeS 2 ↔ ↔ ↔ ↔ Ag 3 Ge 2 S 5 Br takes place at T = 727 K. The crystal structure of Ag 3 Ge 2 S 5 Br was solved and refined using X-ray powder diffraction data: own structure type, space group P2 1 3-b 2 a 5 , Pearson symbol cP44, Z = 4, a = 10.16702(7) Å, R I = 0.0395, χ χ χ χ 2 = 3.19. Ag 3 Ge 2 S 5 Br was also obtained in the glassy state. The charge and mass transfer of the crystalline and glassy phases was investigated by the dc probe method between 250 and 495 K. The samples are purely ionic (Ag + , Br-) conductors. The influence of lining of the transport channels by the halogens (Br-, Ion on the conductivity of crystalline (Ag 3 Ge 2 S 5 Br + 10 wt.% GeS 2) and glassy (Ag 3 Ge 2 S 5 Br) samples was studied. Electronic structure calculations (FP-LAPW method) support the experimental results.

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