Study of Multiferroic and Photovoltaic Behaviour of Transition Metal Doped Double Perovskites

Abstract

ABSTRACT newlineThis project work reports the effect of Ni doping on the structural, micro structural, dielectric, newlineferroelectric, optical, magnetic and leakage current density of iron based double perovskite newlineoxides A2Fe1-XNixNbO6 for composition(A=Mg,Ca and x=0-0.25). The above oxide ceramics newlineare prepared by high temperature (11000C) solid state reaction routes. The compound newlineformation and structure are checked by room temperature XRD Pattern. The purity of the newlineceramics is studied from the EDX pattern. The micro structural study of the compounds has newlinebeen obtained by scanning electron microscopy (SEM). The substitution of Ni in the Mg newlinebased compound has no significant effect on dielectric properties while for Ca based oxides newlinethe thermal stability of dielectric constant increases which is useful for MLCC applications. newlineThe ferroelectric properties of Ca based double perovskites drastically increases after Ni newlinemodification while no effects on Mg based ceramics. The substitution of Ni decreases the newlineband gap of the parent ceramics which will be applicable for PV applications. Existence of newlineboth P-E and M-H loops at room temperature in all the ceramics confirms their multiferroic newlinebehaviors. The good magnetization values of Mg based DP oxides are useful for spintronic newlineapplications. The Ni-substitution decreases the leakage current density of both the ceramics. newlineThe temperature frequency dependence electrical modulus and conductivity show non-Debye newlinetype relaxation and correlated barrier hopping (CBH) behavior in the materials.