Infrared absorption spectroscopy of some bio-glasses before and after immersion in various solutions

The infrared absorption spectra of some selected bioglasses were investigat ed. By using powdered samples of the bioglasses. detailed infrared absorpti on spectra were generated over the 4000-200 cm(-1) range, both before and a fter the glass powder were immersed in the studied solutions for I hr at 95 degreesC. The absorption spectra differed with the bioglass composition an d with the type of the leaching solution. Characteristic absorption bands d ue to vibrations of BO3, BO4. AlO4, MgO4 or ZnO4 groups could be separately identified or combined as composite bands with that due to silicate chains . The Si-O non-bridging stretching band at similar to 950 cm(-1) in the mid region and a far infrared band at similar to 280 cm(-1) due possibly In Na cations vibration were the bands most sensitive to immersion hydration pro cess. Changes were also seen in the appearance of absorption bands at simil ar to 1320, similar to 1460 and similar to 1640 cm(-1) which could he attri buted to phosphate, carbonate and water, respectively.