Abstract
Polycrystalline BiFeO3 (BFO) and Bi0.9Nd0.1FeO3 (BNFO) compounds were synthesized by conventional solid-state route. All the compounds were crystallized in rhombohedral structure with R3c (IUCr No. 161) space group. Negative temperature coefficient of Resistance character has been observed from Complex impedance studies. ac conductivity in these compounds follows universal power law. Correlated Barrier Hopping (CBH) model has been employed to explain the charge carries transport mechanism. Density of states near Fermi level observed to be decreasing with the Nd substitution. Improved insulating character and decrease in density of states in BNFO compound suggested that possible reduction in oxygen vacancies. Activation energies calculated from Arrhenius plots revealed that electronic hopping, oxygen vacancies movements are the contributors to the ac conduction in the measured temperature range.
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