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Issue 29, 2014
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Crystallization of ZrO2-nucleated MgO/Al2O3/SiO2 glasses – a TEM study

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Abstract

In a 61SiO2·17.5MgO·17.5Al2O3·4ZrO2 (mol%) glass, the course of crystallization at a heat treatment temperature of 950 °C is analyzed between t = 0 and 100 h using X-ray diffractometry and (scanning) transmission electron microscopy in combination with energy-dispersive X-ray spectroscopy at multiple stages of heat treatment. It is found that after an initial formation of phase-separation droplets from the vitreous parent glass, high-quartz solid solution crystals are formed, in which ZrO2 nanocrystals are embedded. The diameters of the latter nanocrystals stay approximately constant at around 3.7 nm for all heat treatment times. In contrast to previous investigations of a SiO2–MgO–Al2O3–ZrO2 parent glass with slightly altered composition, no transformation from high- to low-quartz solid solution with increasing heat treatment time is observed here. Moreover, no precipitation of secondary phases like spinel or indialite occurs. Hypotheses concerning possible crystallization mechanisms that occur during heat treatment of the parent glass are discussed.

Graphical abstract: Crystallization of ZrO2-nucleated MgO/Al2O3/SiO2 glasses – a TEM study

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Article information


Submitted
27 Mar 2014
Accepted
04 Jun 2014
First published
04 Jun 2014

This article is Open Access

CrystEngComm, 2014,16, 6578-6587
Article type
Paper
Author version available

Crystallization of ZrO2-nucleated MgO/Al2O3/SiO2 glasses – a TEM study

C. Patzig, M. Dittmer, A. Gawronski, T. Höche and C. Rüssel, CrystEngComm, 2014, 16, 6578
DOI: 10.1039/C4CE00636D

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