Conductivity spectra, which covered frequencies ranging up to the mid-infrared, were obtained for various glasses and temperatures. The systems which were studied included ion-conducting glasses (0.7B2O3-0.3Na2O, 0.7B2O3-0.3Li2O, 0.56Li2O-0.45LiBr-B2O3). In the case of these glasses, it was possible to separate the vibrational and hopping spectra. The resultant hopping spectra exhibited high-frequency plateaux. In the dispersive regime, 2 power-law exponents were identified. One of these was smaller than unity, while the other was greater than unity.

C.Cramer: Berichte der Bunsengesellschaft für Physikalische Chemie, 1996, 100[9], 1497-502