Activation properties of Ag+-ion conduction in bulk amorphous AgI: estimation from extrapolation of the AgI composition dependence in AgI-Ag2O-P2O5 glasses

摘要

AgI-based fast-ion conducting glasses with very high AgI compositions from the (AgI)(x)(AgPO3)(1-x), (AgI)(x) (Ag2PO3.5)(1-x), and (AgI)(x) (Ag3PO4)(1-x), systems were prepared successfully by using a rapid-press quenching and a twin-roller quenching method. The ac dielectric measurements showed common relaxation properties of Ag+-ion conduction in the glasses independently of the species of the glass network formers of AgPO3, Ag2PO3.5, and Ag3PO4, and the activation energies, Deltaepsilon(a), for Ag+-ion conduction were observed to converge upon the same magnitude of similar to26 kJ mol(-1) at the AgI composition limit of x = 1. This indicates the formation of amorphous AgI regions in the glasses, and the value of Deltaepsilon(a) = 26 +/- 1 kJ mol(-1) estimated at x = I was concluded to correspond to that for bulk amorphous AgI which has never been obtained experimentally. [References: 25]