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題名: | Magnetization Processes of Polycrystalline La0.7Pb0.3Mn1-xFexO3 |
作者: | Young, S. L.;Chen, H. Z.;Kao, M. C.;Horng, Lance;Shih, Y. T. |
貢獻者: | 物理學系 |
關鍵詞: | Diffraction;Rhombohedral symmetry;Double exchange;Magnetization;Ferromagnetism |
日期: | 2006-08
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上傳時間: | 2013-02-05T02:19:15Z
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出版者: | Elsevier |
摘要: | 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. |
關聯: | J. Magn. Magn. Mater., 303(2): e351-e354 |
顯示於類別: | [物理學系] 期刊論文
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