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Conductivity investigations of pure and Ba, Ca, Sr doped BiFeO3

Dielectric investigations of pure and diamagnetically substituted Bi1-xAExFeO3 (AE = Ca, Ba, Sr; x=0.1, 0.3) has been carried out. It has been shown that high conductivity of bismuth ferrite is due to movement of oxygen vacancies. Replacement of bismuth by barium, calcium or strontium increases the activation energy of the oxygen vacancies movement, but the activation energy does not follow any particular law over the average ionic radius of the A-site. Also, a relaxor-type dielectric dispersion has been revealed in doped bismuth ferrite, which is absent in pure BFO.