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

Abstract

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 SrFe₁₂O₁₉, CaP₄O₁₁, Na₂Ca₃Si₆O₁₆ and Fe₂O₃ 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.

Keywords:

• Magnetic properties
• glass-ceramic
• crystal growth
• crystallization kinetic

Additional information

Funding

The authors would like to thank the Thailand Research Fund (MRG6080279), the National Research University Project under Thailand's Office of the Higher Education Commission, Thailand, Rajamangala University of Technology Phra Nakorn and Faculty of Science and Technology, Thailand for financial support.