Physico-chemical properties and characterization of caO-Fe 2O 3-P 2O 5 glass as a bioactive ceramic material

Abstract

The aim of this work is to investigate role of iron in calcium-iron- phosphate bioglass. The density, compressive strength, Tg point and leachability of cations were measured. The pH behaviour of simulated body fluid after soaking phosphate glasses for different time periods were also studied and it was observed that higher phosphate glasses containing lower lime possessed better bioactivity than lower phosphate glasses containing more iron and lime contents. The DTA and FTIR spectrometry of glasses were performed. The absorption spectra showed that iron was present in the glass only as Fe 3+ ion. The leachability of Ca2+ and Fe 3+ ions from glass was due to diffusion control and P 5+ ion due to network break down of PO 4 tetrahedra. The DTA peaks were broad. The FTIR band around 1000 cm -1 in glass was due to asymmetric stretching of O=P=O linkage. The FTIR absorption and reflectance spectrometry of the glass samples after SBF treatment had confirmed the deposition of bone-like hydroxyl carbonate apatite layer on the glass surfaces for their bioactivity. The bands centred in between 2880-3425 cm -1 were due to presence of OH groups and stretching modes of H-O-H vibration in glasses. The properties and structure relationship for glasses were established and the results were discussed. © (2011) Trans Tech Publications, Switzerland.