Resolved E-symmetry zone-centre phonons in LiTaO.sub.3./sub. and LiNbO.sub.3./sub..

0378669 - FZÚ 2013 RIV US eng J - Journal Article
Margueron, S. - Bartasyte, A. - Glazier, A. M. - Simon, Elizabeth - Hlinka, Jiří - Gregora, Ivan - Gleize, J.
Resolved E-symmetry zone-centre phonons in LiTaO₃ and LiNbO₃.
Journal of Applied Physics. Roč. 111, č. 10 (2012), "104105-1"-"104105-6". ISSN 0021-8979. E-ISSN 1089-7550.
[International Symposium on Integrated Functionalities (ISIF) /22./. San Juan, Puerto Rico, 13.06.2010-16.06.2010]
R&D Projects: GA AV ČR KAN301370701; GA ČR GAP204/10/0616
Institutional research plan: CEZ:AV0Z10100520
Keywords : phonons * infrared and Raman spectroscopy * lithium niobate * lithium tantalate * ferroelectric
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.210, year: 2012

E-symmetry optical phonons at the gamma point of LiNbO3 were experimentally resolved in spectra measured by infrared and Raman spectroscopy. For this purpose, congruent and nearly stoichiometric crystals of LiNbO3 and LiTaO3, and mixed LiNb1-xTaxO3, crystals were studied. The results show that some of the E modes have weak intensities in Raman or infrared spectra. Thus the complete assignment of E-symmetry modes has been achieved by comparing Raman and infrared data. In addition, this assignment has been confirmed by Raman measurements at low temperatures.
Permanent Link: http://hdl.handle.net/11104/0210083