Structural peculiarities and phonon spectra of A3B2C9 compounds: a Raman-scattering diagnostic

Mikhail P. Lisitsa; Eugen Yu. Peresh; O. V. Trylis; Anatoli M. Yaremko

doi:10.1117/12.306246

20 April 1998 Structural peculiarities and phonon spectra of A₃B₂C₉ compounds: a Raman-scattering diagnostic

Mikhail P. Lisitsa, Eugen Yu. Peresh, O. V. Trylis, Anatoli M. Yaremko

Proceedings Volume 3359, Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics 1997; (1998) https://doi.org/10.1117/12.306246
Event: International Conference on Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics, 1997, Kiev, Ukraine

Abstract

In presented work the Raman spectra of the family of ferroelectric crystals A₃B₂C₉, (here A equals Cs, Rb; B equals Sb, Bi; C equals Br) are given and the assignment of some high frequency bands is fulfilled. The conclusion about possible difference of structure of the crystals Rb₃Bi₂Br₉ and Rb₃Sb₂Br₉ from well known and detaily investigated structure of Cs₃Bi₂Br₉ crystal is made. We also suggest that significant variation of spectra in the temperature region 110 - 300 K can be not only due to phase transition effects but also owing to anharmonic Fermi resonance between one- and two phonon excitations.

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Mikhail P. Lisitsa, Eugen Yu. Peresh, O. V. Trylis, and Anatoli M. Yaremko "Structural peculiarities and phonon spectra of A₃B₂C₉ compounds: a Raman-scattering diagnostic", Proc. SPIE 3359, Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics 1997, (20 April 1998); https://doi.org/10.1117/12.306246

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