Abstract
The compound (LaO) 4Ag 1 · 5Ga 1 · 5S 5 belongs to the quasi-binary La 2O 2SAgGaS 2 system. It undergoes a peritectic decomposition at 1040°C and a order-disorder transition at 750°C. The high temperature variety is tetragonal, with a 0 = 4.18 A ̊ ; c 0 = 18.74 A ̊ ; Z = 1; space group 1422; it has the same structural type as (CeO) 4Ga 2S 5. The low temperature variety is an orthorhombic superstructure of the preceding one. with a = 17.58 (3 a 0√2); b = 5.90 (a 0√2) and c = 18.66 A ̊ (c 0). The electrical conductivity is mainly of ionic nature. The e.m.f. measurements of a cell Ag/(LaO) 4Ag 1 · 5Ga 1 · 5S 5/S.C./Pt support this conclusion.
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