Part II. Large scale applications of NixMn0.8−xMg0.2Fe2O4; 0.1 ≤ x ≤ 0.35 using laser irradiation

NixMn0.8−xMg0.2Fe2O4; 0.1 ≤ x ≤ 0.35 was prepared by standard ceramic technique at sintering temperature 1200 °C using heating / cooling rate 4 °C/min. The samples were irradiated by Nd YAG pulsed laser with energy of the pulse 250 mJ. X-ray diffractograms reveal cubic spinel structure for all the samples before and after laser irradiation. After laser irradiation, better crystallinity was obtained in a form of an increase in the calculated crystal size. This increase was discussed as due to the change in the valence of some ions like Fe3+, Ni2+ and Mn2+. The conductivity of all the investigated samples decreases after laser irradiation and becomes temperature independent for a wider range than that before irradiation. This was ascribed to electron rearrangement after laser irradiation. Accordingly, these ferrites are recommended to be useful in electronic devices.

► X-ray diffractograms of NixMn0.8−xMg0.2Fe2O4 samples before and after laser irradiation are characteristic of cubic spinel structure with better crystallinity after irradiation.
► The crystal size of the ferrite increases after laser irradiation.
► The main conduction mechanism in the investigated system is the correlated barrier hopping and it is the same before and laser irradiation.
► The conductivity decreases after laser irradiation.