???AlN, Aluminium Nitride
Aluminium nitride (AlN) is a nitride of aluminium. Its wurtzite phase (w-AlN) is a wide band gap (6.2 eV) semiconductor material, giving it potential application for deep ultraviolet optoelectronics.
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Refractive Index Reference - Optical constants of crystalline and amorphous semiconductors, Adachi, pg 150
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