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The reflectance spectra of the Tm 3 Al 5 O 12 and Yb 3 Al 5 O 12 single crystals have been studied at room temperature. Fifteen infrared-active modes, out of the 17 theoretically predicted, have been experimentally observed. The infrared data have been analysed by means of the Kramers-Kronig transformation to yield the complex dielectric function, the complex refractive index, the absorption coefficient, as well as the frequencies of the longitudinal (ω LO ) and transverse (ω TO ) long-wavelength T 1u modes. Furthermore, the experimental data are compared and discussed in the light of theoretical lattice dynamical calculations based on the rigid-ion model.
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Papagelis et al. (2002) studied this question.
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