Abstract
The optical parameters refractive index, reflectivity, optical energy band gap, molar refraction, and dielectric and electronic polarizabilities for the polycrystalline Y3−xFe5+xO12 garnet system with x = 0.0, 0.1, 0.3, and 0.5 have been determined from structural parameters. The replacement of large cation Y3+ by smaller cation Fe3+ as well as formation of Fe4+ centers created by native defects is responsible for a decrease in polarizability that followed by decreasing the molar fraction and refractive index. The higher band gap would have a low refractive index. The deviations of measured dielectric and electronic polarizabilities as determined using the Clausius–Mossotti and Lorentz–Lorenz equations from those calculated using the oxide additivity rule are believed to result from garnet structural constraints leading to the “compressed cation” effect.
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