Effect of composition and crystallization temperature on microstructure of Y- and Er-SiAlONIw-phase glass-ceramics

MacLaren, I. , Falk, L. K.L., Díaz, A. and Hampshire, S. (2001) Effect of composition and crystallization temperature on microstructure of Y- and Er-SiAlONIw-phase glass-ceramics. Journal of the American Ceramic Society, 84(7), pp. 1601-1608. (doi:10.1111/j.1151-2916.2001.tb00884.x)

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Abstract

Glass-ceramics were produced from Y- and Er-SiAlON compositions containing the Iw phase as the only detectable crystalline phase. TEM analysis showed that these materials had fine-scale glass-ceramic microstructures with crystallite sizes <1 μm and glass contents between 20% and 40%, depending on the starting powder composition: Increased yttrium or erbium content of the starting material resulted in a reduced glass content. The Iw-phase crystals in all specimens were found by EDX analysis in TEM to display a solid-solution range with a clear anticorrelation between the yttrium or erbium content and the silicon content: A possible explanation for this effect was suggested. The average crystal composition approximated a cation ratio of Y:Si:Al = 3:2:1. The composition of the residual glass was also similar in all specimens. Some small silicon-rich amorphous features were found in the microstructures, and it was believed that these had occurred because of phase separation in the glass during the crystallization process.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:MacLaren, Dr Ian
Authors: MacLaren, I., Falk, L. K.L., Díaz, A., and Hampshire, S.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of the American Ceramic Society
Publisher:Wiley
ISSN:0002-7820
ISSN (Online):1551-2916

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