OPTICAL AND INFRARED PROPERTIES OF AL2O3 AT ELEVATED TEMPERATURES, Volume 2
Final technical rept. 1 Aug 1963-31 May 1964,
PHILCO RESEARCH LABS NEWPORT BEACH CA
Pagination or Media Count:
An investigation was made of the absorption coefficient and the index refraction as a function of both wavelength and temperature. Samples of single crystals of Al2O3 sapphire were heated to various temperatures up to 2020C. The absorption coefficient and index of refraction were measured as a function of wavelength from 0.546 microns to approximately 6 microns. Measurements of the emission of polycrystalline Al2O3, which is a ceramic material made for use in high temperature furnaces, indicates that the general behavior of the emissivity is similar to what one would expect on the basis of the measurements of the absorption coefficient of the single crystal sapphire.
- Geology, Geochemistry and Mineralogy