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Title: Magnetization Processes of Polycrystalline La0.7Pb0.3Mn1-xFexO3
Authors: Young, S. L.;Chen, H. Z.;Kao, M. C.;Horng, L.;Shih, Yu-Tai
Contributors: 物理學系
Keywords: Diffraction;Rhombohedral symmetry;Double exchange;Magnetization;Ferromagnetism
Date: 2006-08
Issue Date: 2013-01-07T09:25:38Z
Publisher: Elsevier
Abstract: 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.
Relation: Journal of Magnetism and Magnetic Materials, 303(2): e351-e354
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