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Effect of trace carbon on the uv-induced behavior of aluminum nitride ceramics

Published online by Cambridge University Press:  03 March 2011

J.C. Kaplan  and
R.A. Gerhardt
J.C. Kaplan
Affiliation:
School of Materials Science and Engineering, The Georgia Institute of Technology, 778 Atlantic Drive, Atlanta, Georgia 30332-0245
R.A. Gerhardt*
Affiliation:
School of Materials Science and Engineering, The Georgia Institute of Technology, 778 Atlantic Drive, Atlanta, Georgia 30332-0245
*
a)Author to whom correspondence should be sent.
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Abstract

The effect of uv irradiation on the material properties of AlN containing low oxygen content (<0.3 wt. %) has been investigated. Upon irradiation with a 150 W Hg-Xe arc lamp, increases in dielectric loss and thermal conductivity drops were observed. Changes in the optical properties, including formation of an absorption band at 650 nm, and photodarkening were also observed. All samples were characterized for trace impurities including carbon, calcium, and oxygen. The magnitude of the uv-induced drops in dielectric loss and the absorption at 650 nm of samples tested were found to depend on the presence of trace levels of residual carbon. UV-induced increases in dielectric loss show an inverse relationship, and formation of an absorption band shows a direct relationship to carbon content.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 9 , Issue 9 , September 1994 , pp. 2209 - 2212
Copyright
Copyright © Materials Research Society 1994

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