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Bi2−xBaxFe4O9 material (0 ≤ x ≤ 0.125) has been synthesized by sol–gel method. Structural characterization shows the single phase of orthorhombic Bi2Fe4O9. Moreover, the structure of Bi2−xBaxFe4O9 gradually presents a regular variation with increasing Ba content. Surface morphology of the samples is examined showing homogeneous grain distribution accompanied by the decreasing grain size with increase...
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