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Abstract : Dielectric spectra of Rb2ZnCl4 were determined in the 6-400 cm-1 region for 300 and 90 K. In the 30-400 cm -1 region they were evaluated from bulk reflectivity measurements, in the 6-22 cm-1 region they were calculated from complex transmittance measurements performed on a tunable monochromatic BWO spectrometer. All polar modes were approximately assigned and their parameters determined. No amplitudon and phason were observed in the incommensurate phase because of a high background absorption. A hard A1 mode at 18 cm-1 was seen below 130 K in agreement with Raman results.

Keywords : ferroelectric materials infrared spectra of inorganic solids lattice dynamics of ferroelectric crystals reflectivity rubidium compounds





Autor: J. Petzelt A.A. Volkov G.V. Kozlov S.P. Lebedev J.P. Chapelle

Fuente: https://hal.archives-ouvertes.fr/



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