Abstract
Ultraviolet optical properties near the edge of transparency (just above and below the band gap) of polycrystalline ALON (aluminum oxynitride, Al23O27N5) and spinel are not well characterized. The edge of transparency is commonly found to obey Urbach's rule, and this is the case for single-crystal sapphire and polycrystalline ALON and spinel as well. Room-temperature transmission and reflection measurements are made from 2500 to 1150 A on these materials and the corresponding absorption coefficient at the band gap is represented by Urbach's rule.
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