Effect of Mn–Zn ferrite on apatite–wollastonite glass-ceramic (A–W GC)

Abstract

Magnetic bioactive glass-ceramics (M GC) were prepared by doping apatite–wollastonite glass-ceramic (A–W GC) with Mn–Zn ferrite. The effect of different contents of Mn–Zn ferrite on the phase structure, magnetic property and bioactivity of A–W GC was investigated. X-ray powder diffraction results showed that A–W GC exhibited apatite, fluorapatite and wollastonite as the main phases. The doping of Mn–Zn ferrite caused the formation of a new phase Zn0.75Mn0.75Fe1.5O4 in M GC. The amount of this new phase increased with increasing content of Mn–Zn ferrite. Under a magnetic field of 7.96 × 105 A m−1, the saturation magnetization of M GC increased from 4.63 to 9.7 A m2 kg−1, but the coercive forces of M GC decreased from 2.39 × 104 to 7.56 × 103 A m−1 as the Mn–Zn ferrite content increased from 5% to 20% in the material. The bioactivity of samples was evaluated by soaking in simulated body fluid (SBF). The results showed that the doping of Mn–Zn ferrite decreased the bioactivity of A–W GC dramatically. It took 7 days for an apatite layer to form on the surface of A–W GC, while at least 30 days was needed for an apatite layer forming on the surface of M GC.