Abstract
Glass of composition 40SiO 2–20B 2O 3–30CaO–10M 2O 3 (M = Al, Cr, Y and La) were prepared by the splat quenching technique to investigate the effect of M 2O 3 on their bioactivity, structural and optical properties. Y 2O 3 and Cr 2O 3 containing glasses formed a crystalline hydroxyapatite (HA) layer after dipping in simulating body fluid (SBF) for 25 days. On the other hand, HA layer could not form in Al 2O 3 and La 2O 3 glasses. However, during soaking in SBF solution, these glasses exhibit higher dissolution rate, lower density and increased optical band gap as compared to unsoaked glasses. Their oxygen molar volume was also higher than for Y 2O 3 and Cr 2O 3 glasses. The change in composition affects the cross-link formation in the glass matrix and finally its durability and bioactivity in SBF. The results show that M 2O 3 plays an important role in controlling chemical durability and bioactivity of the glasses.
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