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Structural distortions and magnetisms in Fe-doped LaMn1-xFexO3 （0 〈 x ≤0.6）

郑龙、吴小山

2013中国物理B：英文版Materials Science被引 2

摘要

X-ray absorption spectra(XAS) at Mn K-edge and Fe K-edge in LaMn1-x Fe x O3show that with the increase of Fe substitution the chemical valence of Mn4+decreases,while the chemical valence of Fe3+remains unchanged.Structural distortions,such as the rotating and tilting for oxygen octahedron in the unit cell vary with iron content.A phase transition occurs at the Fe content values of 0.2～0.3.The evolutions of rotation and tilting angle of FeO6/MnO6octahedral may be the vital factors to the structure and magnetism.We believe that the spin configuration of Fe3+may vary from the intermediate spin t42g e1g(S = 3/2) to the higher spin t32g e2g(S = 5/2) near the phase transition.

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