Abstract
Transition metal ion, Fe ion, doped at B site of samarium cobaltite (SmCoO3) perovskite was synthesized by solid state reaction method. The structural studies using X-ray diffraction technique confirmed perovskite structure with orthorhombic symmetry for SmCo1-xFexO3 (x = 0, 0.4, 0.6, 1.0) at room temperature. The scanning electron microscopy images show porous morphology for the synthesized samples. The vibrational band observed at 426 cm−1 in FTIR spectrum corresponds to Co–O stretching mode in cobaltite system. The DC conductivity increases with increase in temperature and was explained by the hopping model. The cole-cole plot explained the dielectric relaxation mechanism and established the negative temperature coefficient of resistance (NTCR) for the material. The relaxation frequency observed from the imaginary impedance plot is temperature dependent and obeyed Arrhenius relation. The activation energy for different composition is in the range 0.011–0.017eV. The frequency dependent conductivity spectra were explained on the basis of Jonscher's power law.
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