Abstract
The orthoferrite perovskite oxides Eu1-xSmxFeO3 (ESFO) (x = 0.1, 0.5, 0.9) are synthesized in the bulk phase using the sol-gel citrate method. The Rietveld refinement of the X-ray diffraction pattern of the samples shows that the materials are synthesized in the orthorhombic Pbnm phase. The dielectric relaxation of the samples is investigated using the impedance and electric modulus formalisms in the frequency range from 42 Hz to 5 MHz and in the temperature range from 313 K to 603 K. The Cole-Cole model is used to explain the relaxation mechanism in ESFO. The Nyquist plot of complex impedance show a decrease in the bulk resistance of the materials with the increase of temperature. The conductivity is found to increase with the increase of Sm substitution at the Eu site. The frequency dependent conductivity spectra follow the power law. The activation energy is calculated using the small polaron hopping (SPH) model and it is found to be in the range of 0.3–0.4 eV. The value of activation energy supports that the conduction in these materials is due to the polaron hopping.
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