Dynamics of mobile ions in inorganic glasses

In order to study the ion dynamics of several inorganic glasses, we have taken conductivity spectra, extending from a few hertz up to the terahertz regime. At high frequencies the dynamic conductivity is governed by vibrational contributions, whereas ionic hopping sequences determine the low-frequency part of the spectra. In an intermediate frequency regime, both hopping and vibrational contributions do contribute to the dynamic conductivity. The shape of the vibrational conductivity is discussed for various glasses. Ionic hopping motion is brought into focus by removing the vibrational part from the total experimental spectra. The resulting spectra are discussed in terms of the concept of mismatch and relaxation.