Abstract
Polycrystalline ceramics, Bi1-2xBa2xFe1-xNbxO3 (x = 0.00–0.15), were synthesized by solid state reactions method. X-ray diffraction data have revealed elimination of impurity phases and an increase in unit cell volume with Ba and Nb substitution. Diffraction peak splitting is found to be suppressed which indicates a decrease in octahedral distortion. The Mössbauer spectra demonstrate the suppression of spiral spin modulation of the magnetic moments resulting in enhanced ferromagnetism with increasing dopant concentration. The leakage current density of the sample with x = 0.10 is found to be greatly reduced up to six orders of magnitude as compared to the undoped sample. Ohmic conduction is found to be dominant mechanism in all the samples, however, undoped sample showed space charge limited conduction in high electric filed region, while the sample with x = 0.15 exhibited grain boundary limited conduction in low electric field region.
Highlights
Multiferroics are the materials which include two or more of the primary ferroic properties namely ferroelasticity, ferroelectricity and ferromagnetism.[1]
From X-ray Diffraction (XRD) plots it is clear that the formation of impurity phases like Bi25FeO4024 and Bi2Fe4O925 is greatly suppressed in the doped samples
The major impurity peaks are lying in the 2θ range of 25 ◦–40 ◦ in the XRD data of undoped sample; these impurity peaks are gradually disappeared with increasing doping concentration
Summary
Multiferroics are the materials which include two or more of the primary ferroic properties namely ferroelasticity, ferroelectricity and ferromagnetism.[1]. It has been reported that substitution of Nb at Fe sites in BiFeO3 ceramics introduces ferromagnetism.[13] Jun and Hong[22] have observed enhanced remanent magnetization and coercive field in Co and Nb co-doped BiFeO3 as compared to the undoped sample. Considering these aspects, BiFeO3 is substituted by Ba2+ and Nb5+ at Bi3+ and Fe3+ sites, respectively, and the resulting materials, i.e., Bi1-2xBa2xFe1-xNbxO3, have been characterized for structural, electrical transport and magnetic properties. In the present study BiFeO3 is doped with Ba2+ and Nb5+ in order to compensate the charge and investigate the effects of variation of the symmetry on the electric and magnetic response of the material
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