Abstract
Polycrystalline Y0.9R0.1Fe0.5Cr0.5O3 (R = Eu and Nd) ceramics have been synthesized by a sol-gel method. All the refined X-ray diffraction patterns reveal that the materials are orthorhombic structure with space group Pnma. The temperature-induced magnetization reversal is observed in all samples. Three compensation temperatures induced by magnetic interaction are observed in Y0.9Nd0.1Fe0.5Cr0.5O3 sample. The magnetization reversal makes these materials attractive candidates for the magnetic sensor devices. Low-temperature dielectric behavior and impedance spectrum are investigated at different temperatures from 70 to 300 K. These materials exhibit thermally activated relaxation behavior and colossal dielectric constant in a wide temperature and frequency range. Based on the complex impedance spectra, the high dielectric constant can be ascribed by the internal effect of the bulk grains and grain boundaries.
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