EPJ Web Conf.
Volume 132, 2017XXV-th Congress on Spectroscopy
|Number of page(s)||2|
|Published online||13 December 2016|
Study of wide band-gap crystal LiCaAlF6 by IR-reflection spectroscopy and ab initio calculations
Institute for Spectroscopy RAS, 108840 Troitsk, Moscow, Russia
* Corresponding author: firstname.lastname@example.org
Published online: 13 December 2016
Polarized IR-reflection spectra and results of ab initio calculations of vibrational and electronic properties of LiCaAlF6 single crystal are presented. It is shown that the crystal band gap is direct. Experimental and theoretical parameters are obtained for dipole-active and all phonons, respectively, including silent modes. Experimental IR-reflection and Raman spectra are well described in the frame of results obtained by ab initio calculations. The peculiarities are discussed concerning the structure of electronic bands, the interatomic interactions, the character of lattice vibrations, and the phonon dispersion.
© The Authors, published by EDP Sciences, 2017
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