Lattice Vibration Spectra. LXXV. IR Single Crystal Reflection Spectra of Sr(C103)2
نویسنده
چکیده
Polarized infrared reflection spectra of Sr(C103)2 single-crystal plates are recorded and analysed for the frequencies of the transversal and longitudinal optical zone-centre phonon modes and other oscillator parameters by Kramers-Kronig analyses and both the classical 3 parameter (dielectric sum-function) and the 4 parameter (factorized form) oscillator-fit methods. The frequencies computed are compared with the results of previous single-crystal Raman studies. Because of the great distortion of the C10 3 ions (site symmetry C J , no intraionic coupling of the CIO vibrations to symmetric ( v j and asymmetric (v3) stretching modes occurs. The TO/LO splittings of respective CIO unit-cell group modes rank like the vector elements of the corresponding CIO bonds with respect to the crystal axes.
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