The temperature dependence of the infrared reflection spectra in the fluoperovskites RbCaF3, CsCaF3and KZnF3
- 10 October 1986
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 19 (28) , 5757-5767
- https://doi.org/10.1088/0022-3719/19/28/025
Abstract
Infrared reflection spectra of the fluoperovskites RbCaF3, CsCaF3 and KZnF3 have been measured in the range 50-4000 cm-1 at several temperatures. A systematic study of the temperature dependence of the TO and LO frequencies, dampings, and oscillator strengths of the three polar phonon modes is reported. The ionic effective charges have been calculated from the TO-LO splittings. A slight increase of the static dielectric constant upon cooling indicates incipient ferroelectric character.Keywords
This publication has 14 references indexed in Scilit:
- First-principles study of structural instabilities in halide-based perovskites: Competition between ferroelectricity and ferroelasticityPhysical Review B, 1985
- Infrared spectroscopy in KNbO3through the successive ferroelectric phase transitionsJournal of Physics C: Solid State Physics, 1984
- Long-wavelength phonons in the four phases of {N(CH3)4}2CuCl4 and effective chargesZeitschrift für Physik B Condensed Matter, 1983
- Lattice dynamics, lattice instabilities and phase transitions in fluoride perovskitesJournal of Physics C: Solid State Physics, 1982
- The infrared reflectivity in SrTiO3 and the antidistortive transitionSolid State Communications, 1982
- Growth of large KZnF3 single crystals by the czochralski methodJournal of Crystal Growth, 1980
- Soft mode spectroscopy in barium titanateJournal of Physics C: Solid State Physics, 1980
- Croissance cristalline des composés fluorés de type RbCoF3 perovskite et RbCoCrF6 pyrochloreJournal of Crystal Growth, 1971
- Infrared Studies of Some Perovskite Fluorides. I. Fundamental Lattice VibrationsJournal of Applied Physics, 1967
- Infrared Transmission Spectrum and Lattice Vibration Analysis of Some Perovskite FluoridesThe Journal of Chemical Physics, 1967