Surface reaction of bioactive and ferrimagnetic glass-ceramics in the system FeO-Fe2O3-CaO-SiO2

A glass of the composition Fe2O3 40, CaO 32, SiO2 31, P2O5 3 in weight ratio is converted into a bioactive and ferrimagnetic glass-ceramic which is chemically stable in the body environment for a long period by a heat treatment. This type of galss-ceramic is believed to be useful as thermoseeds for hyperthermia treatment of cancers.