Mechanism and kinetics of glass-ceramics formation in the LiO2-SiO2-CaO-P2O5-CaF2 system

• Authors: Martin Palou , Eva Kuzielová , Martin Vitkovič , Maha Noaman
• Languages of publication: EN

Abstracts

EN

Two glasses based on lithium disilicate (LS2), with and without fluorapatite (FA), were synthesised in the Li2O-SiO2-CaO-P2O5-CaF2 system with P2O5: CaO: CaF2 ratios corresponding to fluorapatite. Glass-ceramics have then been prepared by thermal treatment. The mechanism and kinetics of crystallization as functions of grain size and rate of heating were investigated using thermal analysis methods. The smaller particles crystallize preferentially by surface crystallization, which is replaced by volume crystallization at larger particle sizes. Inclusion of FA in the LS2 favours crystallization through the surface mechanism. The onset limit for volume crystallization replacing the surface mechanism is at about 0.3 mm for pure LS2 glass and 0.9 mm for glass containing FA. The calculated activation energies of the glasses (299 ± 1 kJ mol-1 for pure LS2 glass and 288 ± 7 kJ mol−1 for glass containing FA according to Kissinger, or 313 ± 1 kJ mol-1 for pure LS2 glass and 303 ± 8 kJ mol-1 for glass containing FA according to Ozawa) indicate that the tendency of the glasses to crystallize is supported by the FA presence. Bioactivity of all samples has been proved in vitro by the formation of new layers of apatite-like phases after soaking in SBF. [...]

Keywords

EN

Glasses; Glass-ceramics; Crystallization mechanism; Kinetics; Bioactivity

• Publisher: De Gruyter Open
• Journal: Open Chemistry
• Year: 2009
• Volume: 7
• Issue: 2
• Pages: 228-233

Dates

published

1 - 6 - 2009

online

9 - 4 - 2009

Contributors

author

Martin Palou

• Slovak University of Technology, Faculty of Chemical and Food Technology, STU, 812 37, Bratislava, Slovak Republic

author

Eva Kuzielová

• Slovak University of Technology, Faculty of Chemical and Food Technology, STU, 812 37, Bratislava, Slovak Republic

author

Martin Vitkovič

• Slovak University of Technology, Faculty of Chemical and Food Technology, STU, 812 37, Bratislava, Slovak Republic

author

Maha Noaman

• Slovak University of Technology, Faculty of Chemical and Food Technology, STU, 812 37, Bratislava, Slovak Republic

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Identifiers

DOI

10.2478/s11532-009-0002-6