Abstract
The present work aims to investigate the pre- and post-effect of 50 MeV Li3+ ion irradiation at a fluence of 5×1013 ions/cm2 on the dielectric properties of Y3+xFe5−xO12, x=0.0, 0.2, 0.4 and 0.6, garnet system over broad temperature, 300–673 K, and frequency, 100 Hz–13 MHz, ranges. Thermal variation of ac resistivity measurements suggests that the mechanism responsible for conduction in the system is polaron hopping. The observed modifications in dielectric properties after swift heavy ion irradiation are mainly due to the modifications of the metal–insulator contacts due to radiation damage-induced disorder and irradiation-induced point/cluster of defects in the material and also compressive strain generated in the lattice structure. The electric modulus presentation and the complex impedance spectral analysis have been employed to study the relaxation process. The YFeO3 phase is found to be irradiation hard phase as compared with the garnet phase.
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