Abstract
The utility of the concept of optical channel in understanding the optical properties of insulating materials was briefly reviewed by considering how the indices of refraction n of the seven TiO 2 allotropes, TiOF 2, TiF 4 and the binary compounds MQ (M = Zn, Cd; Q = O, S, Se, Te) are related to their total absorption power per formula unit I( ɛ 2) × V and their formula unit volume V. Important factors governing the optical properties of insulating materials are discussed.
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