Abstract
Bi1−xBa x FeO3 (x = 0, 0.1, 0.2 and 0.3) ceramic nanopowders were prepared by the ethylene glycol-based sol–gel method followed by heat treatment at 800 °C for 1 h. The effect of Ba2+ ions substitution on the structural and magnetic properties of the BiFeO3 (BFO) has been investigated. X-ray diffraction along with Rietveld refinement of Ba-substituted samples showed the presence of both rhombohedral (R3c) and pseudocubic (Pm3m) phases. Microstructural analysis confirmed the formation of homogeneous and nearly cubic nanoparticles. Result shows a reasonable enhancement in saturation magnetization of the substituted samples. Bi0.9Ba0.1FeO3 having 30% R3c and 70% Pm3m phases, show maximum saturation magnetization, i.e., 0.32 emu/g at room temperature. The magnetic properties of synthesized ceramics have been discussed in terms of FeO6 octahedra tilting with respect to body diagonal of the pseudocubic system. By combining magnetic measurements with thermal analysis, it is shown that the substitution of Ba for Bi site causes an enhancement in magnetic transition temperature (TN).
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