Structure and electrical properties of Cu+ ion-conducting oxyhalide glasses in the system CuI—CuPO3—Cu2MoO4
Abstract Cu + ion-conducting glasses were prepared in the pseudoternary system CuI—CuPO 3 —Cu 2 MoO 4 . Infrared spectra of the glasses with a constant CuI content suggested that non-bridging oxygens were more preferentially formed in the phosphate groups than in the molybdate groups. This preference order for non-bridging oxygen formation was consistent with the order of acidity, P 2 O 5 >MoO 3 , of the glass-forming oxides in melts. These glasses showed high ionic conductivities of 10 -2 to 10°Sm -1 at room temperature. For the glasses with a constant CuI content, the conductivity at 298 K of the glasses decreased non-linearly with an increase in the composition parameter x , which denotes the ratio of the number of phosphorus atoms to the total number of phosphorus and molybdenum atoms included in the glasses, x =[ rmP ]/([ rmP ] +[ rmMo ]). The activation energy for conduction inceased non-linearly with an increase in x . These non-linear changes in the conductivity and in the activation energy were correlated with the structural change during melting of these glasses.