Abstract
We analyse experimental ac conductivity data of various glassy(61SiO2·35Li2O·3Al2O3·P2O5 and alkali triborates of formulae M2O·3B2O3 with M = Li, Na, K or Rb) and crystalline ionic conductors (Li0.18La0.61TiO3 and yttriastabilized zirconia with a 16% molar yttria content, (Y2O3)0.16(ZrO2)0.84) attemperatures ranging from 400 down to 8 K. At sufficiently low temperatures thedielectric loss is found to be almost independent of frequency, and thisnear constant loss (NCL) shows a weak temperature dependence in allcases. We find good agreement between the experimental data and thetheoretical predictions of a new scheme for NCL based on the coupling model.
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