Abstract
Deals with the transition-temperature region (TR) in the DC electrical resistivity ( rho )-temperature (T) dependence of lead borate glasses with PbO content up to 24 mol.%. The temperature dependence of ln mod (1/ rho c) delta rho / delta T mod , where rho c is the resistivity at the critical temperature, is characterised by: (i) two straight lines with an intersection at a certain compensation point, in the case of untempered samples and samples tempered at 340 degrees C; (ii) three straight lines with a common intersection point, for samples tempered within the range 380-460 degrees C. These results are attributed to the compensation effect due to the entropy fluctuations in the mean electron density and the polarisation at the interface between the metastable microphases. Mathematical relations have been derived for rho (T) in both cases. A reasonable fit is obtained between the theoretical and experimental plots of rho (T) in the TR.
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