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The pursuit for an appropriate universal scaling factor to satisfy thetime-temperature superposition principle for grain and grain boundary responseshas been explored in the ac conductivity domain for polycrystalline doubleperovskite oxides A2HoRuO6 (AHR; A = Ba, Sr, Ca). The samples show differentstructural phases ranging from cubic to monoclinic with decreasing ionic radii.The degree of distortion in the materials is correlated to the strength ofbonding through the bond valence sum (BVS). The conductivity spectra for allthe samples obey the power law behaviour. The contribution of differentmicrostructural features to the conduction process is established. Thermalvariation of dc resistivity points towards a gradual crossover from nearestneighbour to variable range hopping. The activation energies obtained from dcconductivity, hopping frequency and relaxation frequency show close correlationbetween the conduction and relaxation mechanisms. The scaled conductivitycurves for AHR showed the presence of two different conduction processes withdissimilar activation energies in the grain boundary and grain responseregimes. It is thus concluded that a single scaling parameter is insufficientto satisfy the time temperature superposition principle universally when twodifferent thermally activated regions are present simultaneously in thematerials.

Time-temperature superposition in grain and grain boundary response  regime of A2HoRuO6 (A = Ba, Sr, Ca) double perovskite ceramics: A  Conductivity Spectroscopic Analysis