Abstract
We report the effect of Sr2+ and Mn3+ co-doping BiFeO3 on the crystal structure and the multiferroic properties of Bi0.95Sr0.05Fe1-xMnxO3 (0.0 = x ≤ 0.4, Δx = 0.1) powders, synthesized by assisted high-energy ball milling of stoichiometric mixtures of Bi2O3, Fe2O3, SrO, and Mn2O3; the powders were pressed at 900 MPa and sintered at 800 °C. X-ray diffraction and Rietveld refinement reveal the effect of Sr2+ and Mn3+ on the crystal structure. These elements act as inhibitors of secondary phases. Magnetic behavior, obtained using vibrating sample magnetometry shows antiferromagnetic order and an increase in magnetic susceptibility, due to slight differences in ionic radii and low crystal structure distortion. All the samples show high relative permittivity values, which is augmented by doping with Sr2+ and Mn3+ ions furthermore, the doping increases dielectric dissipation factor; it is attributed to their interaction with different oxidation state cations like Fe3+, Fe2+, Mn3+, Mn2+, Bi3+, and Sr2+, into the crystal structure of BiFeO3. Additionally, it was found increments of the electrical conductivity, due to the domain-wall charge accumulation phenomenon. In the same way, the relative permittivity improves as an effect of domain-walls conductivity, induced by Sr and Mn co-doping. The magnetodielectric effect presents a change in mechanism origin, from core-dominated (grain) to interface-dominated (electrode-dielectric, and grain-grain boundary), as a result of domain-wall charge accumulation.
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