On the power-law behavior of the AC conductivity of the mixed crystal (NH4)3H(SO4)1.42(SeO4)0.58 |
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Authors: | AN Papathanassiou |
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Institution: | Department of Physics, Section of Solid State Physics, University of Athens, Panepistimiopolis, GR 157 84 Zografos, Athens, Greece |
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Abstract: | A power law used to describe the AC conductivity from 299 to 393 K of the mixed crystal (NH4)3H(SO4)1.42(SeO4)0.58 led to fractional exponent values ranging from 1.08 to 0.91, depending on structural changes induced on temperature variation B. Louati, M. Gargouri, K. Guidara and T. Mhiri, J. Phys. Chem. Solids 66 (2005) 762]. In the present note, we suggest that the fractional law exhibits features of lattice relaxation. Despite the structural changes, the parameters of the power law are mutually interconnected to yield a temperature independent phenomenon. Such behavior is probably of general validity and characterizes the universal fractional dispersion of the AC conductivity, as it was also observed in glasses of different composition. |
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Keywords: | A Inorganic compounds D Dielectric properties D Electrical conductivity |
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