Abstract
Structure and crystallization of new chemically modified bioactive glasses based on the composition of ICIE16 were investigated. Solid-state NMR analysis was used to investigate the glass structure. For crystallization, non-isothermal heat treatment was conducted to calculate the crystallization activation energy (Ec) using Kissinger method. The structural analysis results indicate that BP1 glass has the most complicated structure among the synthesized glasses. NMR findings tell that phosphate groups are in QP0 and QP1 units while boron is bonded in B[3] and B[4] units. Moreover, BP1 also exhibited high tendency to volume crystallization (n = 2.6; Ec: 390.4 kJ/mol) in comparison to ICIE16 glass which showed mostly surface crystallization (n = 1.4; Ec: 275.7 kJ/mol). The phases that formed after crystallization are Na4Ca4Si6O18, Ca2SiO4 and Ca5(PO2)4 (SiO4)6. The experimental data indicate that BP1 glass has promising features of processing which may ease bone scaffolds (grafts) fabrication with valuable strength.
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