Electrical conductivities of the superionic composites composed of frozen α-AgI and AgI-based glasses
Abstract New composite materials in which α-AgI was frozen in the superionic conducting glasses in the systems AgI-Ag 2 O-M x O y (M x O y =B 2 O 3 , GeO 2 , P 2 O 5 , MoO 3 ) exhibited extremely high ion conductivities of about 10 −2 −10 −1 S cm −1 at room temperature. In such superionic composites, it was found that fine particles of α-AgI were dispersed in AgI-based glass matrices. During heating of the composites a large drop of conductivities due to the crystallization of the matrix glasses was observed in the case of the composites with P 2 O 5 and MoO 3 , whereas no drastic change in conductivity was observed in the composites with B 2 O 3 and GeO 2 . On cooling process, a conductivity drop due to the α-β phase transformation of AgI was observed in all the composites. However, the temperature at which the conductivity started to drop was lower in the case of the latter composites than in the case of the former composites.