Abstract
A systematic investigation of the magnetic properties in the perovskite materials La 0.7Pb 0.3Mn 1− x Fe x O 3 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 3 ¯ c 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 Mn 3+–O 2−–Mn 4+ double-exchage interaction would be gradually replaced by antiferromagnetic Fe 3+–O 2−–Mn 4+ and Fe 3+–O 2−–Fe 4+ exchange coupling for x = 0.6 and 0.8 and would be completely replaced by Fe 3+–O 2−–Fe 4+ 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 T C and saturation magnetization M S.
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