STUDIES ON SYNTHESIS OF CALCIUM FERRITE-BASED BIO GLASS-CERAMICS

The possibility of synthesizing a Ca-ferrite based biocompatible glass ceramic has been explored in the following two glass compositions: (i ) 28Na(2)O-8CaO-3P(2)O(5)-11Fe(2)O(3)-50SiO(2), and (ii) (2)O-8CaO-3P( 2)O(5)-20Fe(2)O(3)-41SiO(2)-3B(2)O(3) (in weight ratio). The effect of simulated body fluid on the different glasses and glass ceramics was also investigated. While there is no direct evidence for apatite forma tion, the weight losses recorded and formation of a Si-rich layer at t he surface appears to be an indication of onset of apatite formation. The rate of apatite formation is presumably retarded due to the presen ce of Al3+ (picked up from Al2O3 crucible). Ferromagnetic resonance ex periments at 9.03 GHz demonstrate that these glass ceramics can possib ly be used for microwave hyperthermia.