Pre and Post Effect of Swift Heavy Ion Irradiation on Infrared Spectral Evolution of Y₃₊<i>_x</i>Fe_5-<i>_x</i>O₁₂ (<i>x</i> = 0.0 - 1.0) System

Abstract

Present work aims to investigate the effect of Y 3+ -substitution and 50 MeV, Li 3+ ion irradiation (fluence: 5 x 10 13 ions/cm 2 ) on infrared spectral evolution of Y 3+x Fe 5-x O 12 (x = 0.0, 0.2 0.4, 0.6, 0.8 and 1.0) garnet system. Infrared absorption spectra for x = 0.0 -0.6 compositions show three absorption bands while x = 0.8 -1.0 compositions are characterized by two absorption bands, identical with IR spectra of rare earth ortho ferrites. The position and intensity of bands are found to be influenced by Y 3+ -substitution. The intensity of absorption bands for x = 0.0 -0.4 compositions is found to increase, while for x = 0.6 -1.0 compositions no effect of swift heavy ion irradiation has been observed. The results have been explain in the light of SHII induced defect states, partial removal of un-wanted YFeO 3 phase and change in structural parameters. It seems that YFeO 3 phase is irradiation hard phase.