Phase Stabilization of Fe Substituted SmMn2O5: SmFeMnO5

摘要

The SmFeMnO5 phase has been stabilized using mechanical milling and respective high temperature sintering of the oxides in stoichiometric ratio. The crystal structure is studied by Rietveld analysis of the X-ray diffraction data obtained at room temperature. Analysis is done by considering Fe3+ ions at the Mn3+ sites in the parent SmMn2O5 structure and the results indicate the formation of SmFeMnO5. A change in bond angles and bond distances is obtained due to the reduction in the percentage of Mn3+ Jahn–Teller ions. Isothermal magnetization study at room temperature reveal ferromagnetic nature of the material with a saturation magnetization of 6.57 emu/g. A linear decrease in resistivity with temperature is obtained and the activation energy is calculated from Arrhenius plot. Impedance studies show decrease in dielectric constant values with frequency and temperature due to Fe substitution in the SmMn2O5 structure.