HIGH-TEMPERATURE INFRARED PROPERTIES OF SAPPHIRE, ALON, FUSED-SILICA,YTTRIA, AND SPINEL

A vacuum emissometer, utilizing a carbon dioxide laser for high-temper ature sample heating, has been designed and built for use with a Fouri er Transform spectrometer. A two-color pyrometer technique is used to measure sample surface temperature. Oxides such as sapphire, spinel, y ttria, aluminum oxynitride, and fused silica are experimentally charac terized in temperature from 600 to 2000 K and in frequency from 500 to 5000 cm(-1). A glowing yttria sample has also been characterized over the spectral range of 8500 to 13500 cm(-1). Good agreement with tempe rature dependent classical oscillator and quantum mechanical multiphon on models for the complex index of refraction is obtained. (C) 1998 El sevier Science B.V. All rights reserved.