Engineering the properties of materials using swift heavy ions (SHI) is an emerging field of research. It is known fact that when an energetic ion beam passes through the material, the modification in the material is caused due to Coulomb interaction between the target materials, the mean of the projectile ion, its energy and also type of irradiation like its flux, fluence and beam dimension. In the present presentation the results obtained on the 50 MeV Li³⁺ ion irradiation effect on various properties were studied on the perovskite type rare earth orthoferrite single crystals. The rare earth orthoferrite having general formula REFeO₃ where RE can be  Yttrium or rare earth, possess distorted perovskite structure with four equal iron ions per unit cell. Three different compositions of REFeO₃ (where RE = Y, Er and Ho) grown by fluxed melt technique were used. Structural characterization by HRXRD indicated diffused peak in case of irradiated crystal which is attributed to creation of more defects upon irradiation. Mechanical characteristics were studied on pristine and irradiated crystals and it was found that microhardness decreases upon irradiation. The dielectric behavior shows complete dependence on frequency and temperature. Irradiation enhances the value of dielectric constant as well as conductivity and is attributed to disordering of the crystal lattice. The magnetic behavior were observed for these crystals across three different planes (110), (010) and (001). Irradiation affects the values of maximum magnetization, coercivity and remnant magnetization. From magnetization versus temperature curves, the magnetization decreases and Neel temperature was found to increase after irradiation. These studies summarizes that irradiation induces modification in material thus leading to change in the structural, mechanical, dielectric and magnetic properties of these crystal. The detail results will be presented and discussed.

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