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Rare-earth-doped α′-Sialon ceramics with novel optical properties

Published online by Cambridge University Press:  31 January 2011

B. S. B. Karunaratne ,
R. J. Lumby  and
M. H. Lewis
B. S. B. Karunaratne
Affiliation:
Centre for Advanced Materials, University of Warwick, Coventry, CV4 7AL, United Kingdom
R. J. Lumby
Affiliation:
Centre for Advanced Materials, University of Warwick, Coventry, CV4 7AL, United Kingdom
M. H. Lewis
Affiliation:
Centre for Advanced Materials, University of Warwick, Coventry, CV4 7AL, United Kingdom
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Abstract

A new phenomenon in the field of Sialon ceramics is reported which may lead to applications based on their optical or electronic properties in combination with their mechanical and thermal properties. For the first time a colored α′-Sialon ceramic has been synthesized, with relatively high optical transparency by careful control of the sintering atmosphere, and adding suitable rare earths as stabilizing cations. This compares with normal Sialons and silicon nitrides which are grey-black in color and are opaque. Oxidation/reduction mechanisms have been identified as an influence on the valence of the stabilizing cation, which is responsible for the unusual optical properties.

Type
Articles
Information
Journal of Materials Research , Volume 11 , Issue 11 , November 1996 , pp. 2790 - 2794
Copyright
Copyright © Materials Research Society 1996

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