Structure and electrical properties of Cu + ion-conducting oxyhalide glasses in the system CuI—CuPO 3—Cu 2MoO 4

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Cu + ion-conducting glasses were prepared in the pseudoternary system CuI—CuPO 3—Cu 2MoO 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 2O 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.