Abstract
Sol-gel auto combustion method has been used to synthesize M−type barium hexagonal ferrite (BaFe12O19). The defects were created in M−type BaFe12O19 utilizing the 15UD Pelletron tandem accelerator. The synthesized BaFe12O19 was exposed to 200 MeV Ag16+ ions radiation, and the shift in the phase transition of M−type BaFe12O19 were explored through in-situ ultrasonic measurement. The defect-induced sample exhibits reduced magnetization compared to the pristine ferrite, attributed to ion-induced disorder and a decline in superexchange interactions. Further, the defect-induced sample experiences a decrease in coercivity owing to reduced crystallite and grain sizes caused by irradiation. The phase transition temperature shifts from 732 K in the pristine sample to 540 K in the defect-induced sample.
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