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|Magnetization Processes of Polycrystalline La0.7Pb0.3Mn1-xFexO3
|Young, S. L.;Chen, H. Z.;Kao, M. C.;Horng, Lance;Shih, Y. T.
|Diffraction;Rhombohedral symmetry;Double exchange;Magnetization;Ferromagnetism
|A systematic investigation of the magnetic properties in the perovskite materials La0.7Pb0.3Mn1−xFexO3 is presented in this study. The distortion induced by Mn-site substitution is not obvious as radii of Fe and Mn are similar for low Fe-content samples. Powder X-ray diffraction patterns show the same crystallographic phase of rhombohedral symmetry with space group for x⩽0.4 and change to orthorhombic symmetry with space group Pnma for x⩾0.6. The zero field cooling–field cooling curves and the values of temperature-dependence magnetization indicate ferromagnetic Mn3+–O2−–Mn4+ double-exchage interaction would be gradually replaced by antiferromagnetic Fe3+–O2−–Mn4+ and Fe3+–O2−–Fe4+ exchange coupling for x=0.6 and 0.8 and would be completely replaced by Fe3+–O2−–Fe4+ for x=1.0. From the results of experiments, the substitution of Mn by Fe suppresses the double-exchange interaction, weakens the ferromagnetism and consequently decreases the ferromagnetic transition temperature TC and saturation magnetization MS.
|J. Magn. Magn. Mater., 303(2): e351-e354
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