Abstract
Structural, electrical, magnetic and magneto-electric properties of (Bi0.5Ba0.25Sr0.25) (Fe0.5Ti0.5) O3 nanoceramic synthesized by the mechanical alloying method were studied. Structural analysis was studied by Rietveld refinement of room temperature XRD data. The temperature and frequency dependent dielectric data were explained using the different mechanism. The grain and grain boundary effect of the material on the electrical properties has been explained using the existed mechanism. The impedance study reveals a semi conducting grain and insulating grain boundary resulting in the formation of surface and internal barrier layer capacitors leading to the high value of dielectric constant. The frequency dependence of AC conductivity at two different regions can be explained on the basis of correlated barrier Hopping model and quantum mechanical tunneling model. The value of the magneto-electric voltage coupling coefficient, α, of (Bi0.5Ba0.25Sr0.25) (Fe0.5Ti0.5)O3 ceramic is obtained as 2.56 mV cm−1 Oe−1.
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