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We have investigated the magnetic properties of nanostructured magnetic crystals embedded in strontium hexaferrite-bioglass (SF-45S5). The crystallization kinetics, structure and phase formation of nanoparticles were also studied. The incorporation technique was employed to synthesize 45S5 glass. The crystallization rate constant ( n ) of the magnetic bioactive glass was found to be approximately 3. This suggests that bulk crystallization is occurs by a three-dimensional crystal growth. The presence of SrFe 12 O 19 , CaP 4 O 11 , Na 2 Ca 3 Si 6 O 16  and Fe 2 O 3  in all of the quenched glass samples was evidenced by X-ray diffraction results. Micrographs of the crystallized base glass SF-45S5 system, obtained from scanning electron microscopy, showed the presence of granular-like crystals in the glass ceramics. Characteristics of a hard-magnetic material were found for samples, as confirmed by their hysteresis loops.

Crystallization Kinetics, Structure and Phase Formation of Magnetic Nanocrystals in Bioactive Glass Systems