Optical absorption measurements of the different phases of In2Se3 are made. The fundamental absorption edge of α-In2Se3 and γ-In2Se3 is studied as a function of the temperature. Far-infrared reflectivity measurements of the three phases α, β- and γ-In2Se3 are also considered and optical parameters are determined from a least-squares fitting.
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Julien et al. (1990) studied this question.
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