Raman diagnostics of new types of A3B2X9 layered crystals

Olegh V. Vakulenko; Victor O. Gubanov; Stepan V. Kun; Fedir V. Motsnyi; Eugen Yu. Peresh; Volodymyr A. Terekhov

doi:10.1117/12.306241

20 April 1998 Raman diagnostics of new types of A₃B₂X₉ layered crystals

Olegh V. Vakulenko, Victor O. Gubanov, Stepan V. Kun, Fedir V. Motsnyi, Eugen Yu. Peresh, Volodymyr A. Terekhov

Proceedings Volume 3359, Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics 1997; (1998) https://doi.org/10.1117/12.306241
Event: International Conference on Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics, 1997, Kiev, Ukraine

Abstract

Vibrational spectra of layered crystals Rb₃Bi₂Br₉, Rb₃Bi₂I₉, Cs₃Bi₂I₉ were investigated by the method of Raman spectroscopy at 293 K and 100 K. The distribution of vibrational modes by symmetric type was considered for molecular ion [B₂X₉]^3-, for layered packet and for the whole crystal. It is shown that the approximate vibrational forms of the molecule B₂X₉ and the ions [B₂X₉]^3- can be obtained unambiguously using on the symmetry considerations only. The condition is imposed that the vibrational modes in addition to their classification by the symmetry types allow resolution to the quasivalent and quasideformational ones which differ significantly in frequencies. The forms of the normal vibrations of [B₂X₉]^3- are consistent with the vibration forms of the layer packet, whereas the shape of the vibration forms of the given symmetry type for the whole crystal coincides with the shapes of the normal vibration forms of two adjacent elementary packets which have the same or contrary phases. The correlation diagram is built up allows to establish correspondence between the modes of the elementary layer packet and the fundamental vibration modes of the crystal lattice which are combined into the Davydov doublets. The analysis of the obtained experimental results for the A₃B₂X₉ crystals was carried out. It was obtained that at the modification of the chemical composition of the compound by isovalent substitution, the slight change in the vibration forms does not actually effect the power constant, and the frequencies are modified only due to the atoms mass change.

Citation Download Citation

Olegh V. Vakulenko, Victor O. Gubanov, Stepan V. Kun, Fedir V. Motsnyi, Eugen Yu. Peresh, and Volodymyr A. Terekhov "Raman diagnostics of new types of A₃B₂X₉ layered crystals", Proc. SPIE 3359, Optical Diagnostics of Materials and Devices for Opto-, Micro-, and Quantum Electronics 1997, (20 April 1998); https://doi.org/10.1117/12.306241

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available