“…where D is the crystallite size, l is the wavelength with CuK a radiation (1.5406Å), b is the full width at half maximum and q is the Bragg's angle of diffraction. Aer SHI irradiation, the crystallite size was decreased as reported by S. Som et al, 43 but in our case, it was observed that there was an increase in crystallite size with increasing Mn content in the samples, and it was also observed that aer SHI irradiation, there was an increase the crystallite size as compared to the pristine sample. This might be due to the stress released between the grains and the decrease in the concentration of oxygen vacancies at a uence of 1 Â 10 13 ions per cm 2 .…”