科研之友
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摘要
Polycrystalline Bi-1 xLaxFe0.95Mn0.05O3 (x = 0, 0.10, 0.15, 0.20) samples were successfully synthesized via sol-gel method. The magnetic properties and local structures of all these samples are investigated. By increasing lanthanum content from 0 to 0.15, the magnetization increases, while it decreases by further La doping. The results of local structures of Fe atoms and Mn atoms which were measured using X-ray absorption fine structure (XAFS) spectra of Fe and Mn K-edge demonstrate that the former has no change, whereas the latter exhibits systematical change of the Mn-O bond length, resulting from doped La ions. We demonstrate that doped La ions affect the local structures of Mn atoms, whereas it has no influence on the local structures of Fe atoms. Finally, to explain the magnetization phenomenon, we analyze interrelation between magnetic property and the Mn-O bond length on the basis of the local structure distortion of the samples.
