Non-isothermal crystallization kinetics and stability of leucite and kalsilite from K2O-Al2O3-SiO2 glasses

CHRISTOPOULOU, Georgia, MODARRESIFAR, Farid, ALLSOPP, Benjamin, JONES, Hywel and BINGHAM, Paul (2019). Non-isothermal crystallization kinetics and stability of leucite and kalsilite from K2O-Al2O3-SiO2 glasses. Journal of the American Ceramic Society, 102 (1), 508-523.

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Official URL: https://onlinelibrary.wiley.com/journal/15512916
Link to published version:: https://doi.org/10.1111/jace.15944

Abstract

The crystallization mechanisms and elemental stability of leucite and kalsilite formed from K2O-Al2O3-SiO2 glasses were investigated by X-ray powder diffraction (XRD), X-ray fluorescence (XRF), Raman spectroscopy and differential scanning calorimetry (DSC). Glass samples with compositions along the leucite-kalsilite tie-line were produced by melt processing; and were then heat treated at 850ºC, 950ºC and 1250ºC for times ranging from 5 minutes to 1000 hours. Kalsilite is an unstable phase that behaves as an intermediate precursor to leucite. Crystalline materials in which kalsilite is the major phase lose potassium upon prolonged heat treatment (1000 hours at 1250ºC), in contrast to those with leucite, in which little or no compositional alteration is detected. The formation of leucite from stoichiometric kalsilite is accompanied by the formation of potassium doped alumina. The activation energies for leucite and kalsilite crystallization, determined via application of the Kissinger equation to thermal analysis data, were 579 kJ/mol and 548 kJ/mol respectively. Finally, production of pure leucite can be achieved with more favourable crystallization kinetics when starting with off-stoichiometric compositions.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Polymers Nanocomposites and Modelling Research Centre > Polymers, Composites and Spectroscopy Group
Departments: Faculty of Science, Technology and Arts > Department of Engineering and Mathematics
Identification Number: https://doi.org/10.1111/jace.15944
Depositing User: Paul Bingham
Date Deposited: 19 Jul 2018 13:01
Last Modified: 16 Nov 2018 11:41
URI: http://shura.shu.ac.uk/id/eprint/22027

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