Abstract
Using density functional methods, optical properties of KTa0.5Nb0.5O3 (KTN) are investigated. The imaginary part of dielectric function ε2(ω), the optical absorption coefficient I(ω) and the reflectivity R(ω) of KTN in the cubic (paraelectric) and tetragonal (ferroelectric) phases are calculated. The origin of the different behavior of the optical spectra between the two phases is discussed.
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