DIELECTRIC-PROPERTIES OF TRANSITION-METAL OXIDE GLASSES

Dielectric properties of iron and vanadium phosphate glasses containin g different glass modifiers have been studied in a broad range of freq uency and temperature by the absorption current and with an ac transfo rmer bridge. The dielectric spectra exhibit a peak that can be related to the electron transfer between iron atoms in different valency stat es. This peak and the de conductivity revealed a similar activation en ergy. The data obtained were interpreted in the framework of a new mod el of relaxation in glasses recently proposed by Hunt.