Magnetization processes of polycrystalline La0.7Pb0.3Mn1-xFexO3

S. L. Young, H. Z. Chen, M. C. Kao, L. Horng, Y. T. Shih

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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 R over(3, -) c for x{less-than or slanted equal to}0.4 and change to orthorhombic symmetry with space group Pnma for x{greater than or slanted equal to}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.

Original languageEnglish
Pages (from-to)e351-e354
JournalJournal of Magnetism and Magnetic Materials
Issue number2 SPEC. ISS.
Publication statusPublished - 2006 Aug

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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