The nucleation and crystallization of MgO–B2O3–SiO2 glass

The nucleation and crystallisation of MgO-B2O3-SiO2 (MBS) glasses were studied by a non-isothermal, thermal analysis technique, XRD and SEM. The temperature range of the nucleation and the temperature of the maximum nucleation rate for MBS glasses were determined from the dependences of the inverse...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2011-11, Vol.31 (13), p.2211-2219
Main Authors: Krzmanc, M M, Dosler, U, Suvorov, D
Format: Article
Language:English
Subjects:
Ceramics
Crystal growth
Crystallization
Differential scanning calorimetry
Glass
Inverse
Nucleation
Three dimensional
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Summary:The nucleation and crystallisation of MgO-B2O3-SiO2 (MBS) glasses were studied by a non-isothermal, thermal analysis technique, XRD and SEM. The temperature range of the nucleation and the temperature of the maximum nucleation rate for MBS glasses were determined from the dependences of the inverse temperature at the DSC peak (1/Tp) and the maximum intensity of the exothermic DSC crystallisation peak ((deltaT)p) on the nucleation temperature (Tn). For MBS glasses the nucleation occurred at 600-750 C, with the maximum nucleation rate at 700 C, whereas the nucleation and crystal growth processes overlapped when T was between 700 and 750 C. Analyses of the non-isothermal data for the bulk MBS glasses using the most common models (Ozawa, Kissinger, modified Kissinger, Ozawa-Chen, etc.) revealed that the crystallisation of Mg2B2O5 was three-dimensional with a diffusion-controlled crystal growth rate, such that n = m = 1.5 and that the activation energy for the crystallisation was 410-440 kJ/mol.
ISSN:0955-2219
DOI:10.1016/j.jeurceramsoc.2011.05.048