Abstract: Bioactive and ferromagnetic glass-ceramics are useful as thermoseeds for hyperthermia treatment of cancer.The ferromagnetic glass-ceramics in the system FeO-Fe₂O₃-CaO-SiO₂ have been prepared with the addition of a small amount of B₂O₃ and P₂O₅.The microstructure analysis, XRD, magnetometer test and soaking in simulated body fluid have been carried out in the study of the ferromagnetic glass-ceramics.The results show that the glass-ceramics have two important properties:magnetic properties and bioactivity.Better microstructure with the main crystal magnetite and secondary crystal wollastonite evenly distributed can be obtained through the optimal heat treatment carried out directly under 1 000℃ for two hours without nucleation, and the magnetic properties of the ferro-magnetic glass-ceramics thus made are the best in quality.With the increase of Fe content, the magnetic properties tend to increase.On the other hand, Fe can suppress the formation of the apatite on the surface of glass-ceramics.It is, therefore, necessary to carry out in-depth research to find the way to balance the effects of Fe.

Key words: ferromagnetic glass-ceramics, bioactivity, magnetic properties, bioceramics, hydroxypatite, thermoseed, hyperthermia