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CeO2 and Y2O3 as nucleation inhibitors in lithium disilicate glasses

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Abstract

Stoichiometric lithium disilicate glasses were doped with up to 3 mol% CeO2 or Y2O3 and the nucleation and crystal growth kinetics were determined as a function of temperature using in situ hot-stage microscopy. The additives led to a decrease of the steady-state nucleation rates by up to two orders of magnitude and a remarkable increase of the induction time. Moreover, the crystal growth velocities are notably decreased, while the activation energy for crystal growth increases. The cerium-containing samples were analyzed by fluorescence microscopy and spectroscopy, scanning electron microscopy as well as cathodoluminescence measurements. The lithium disilicate crystals consist of fine lamellae separated from each other by a cerium-enriched residual glassy matrix and the crystallization front is enriched by the added oxide. As a result, CeO2 and Y2O3 act as nucleation inhibitors in lithium disilicate glass.

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Acknowledgements

The authors thank Sven Schönherr from the Institute for Solid State Physics, Jena University, for the cathodoluminescence and EDX measurements.

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  1. Otto-Schott-Institut für Materialforschung, Jena University, Fraunhoferstr. 6, 07743, Jena, Germany

    Katrin Thieme & Christian Rüssel

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  1. Katrin Thieme
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  2. Christian Rüssel
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Correspondence to Katrin Thieme.

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Thieme, K., Rüssel, C. CeO2 and Y2O3 as nucleation inhibitors in lithium disilicate glasses. J Mater Sci 51, 989–999 (2016). https://doi.org/10.1007/s10853-015-9430-1

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  • DOI: https://doi.org/10.1007/s10853-015-9430-1

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