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Stable and Metastable Phases in the Systems AgI-Ag 2 XO 4 (X=Cr, Mo, W)

1976; De Gruyter; Volume: 31; Issue: 8 Linguagem: Inglês

10.1515/zna-1976-0815

1865-7109

A. Magistris, Gaetano Chiodelli, Giuseppina Viganò Campari,

Glass properties and applications

Abstract DTA and powder x-ray diffraction measurements allowed to draw the phase diagrams of the systems AgI-Ag 2 XO 4 (X = Cr, Mo, W). A more detailed investigation was devoted to the composition range around X AgI = 0.8, where in preliminary tests it was observed that the room temperature ionic conductivity strongly depends on the thermal treatment of the sample. By quenching mixtures at X AgI = 0.8, glass-like phases with high conductivity were obtained; in the systems AgI-Ag 2 CrO 4 and AgI-Ag 2 MO 4 the subsequent crystallization gave rise to non con-ducting phases, whereas the occurrence of the highly conducting compound 4AgI·Ag 2 WO 4 was recognized in the third system investigated.