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Optical phonon modes and transmissivity in BaWO 4 single crystal
Author(s) -
Ran Donggang,
Xia Hairui,
Sun Shangqian,
Zhao Peng,
Liu Fengqin,
Ling Zongcheng,
Ge Wenwei,
Zhang Huaijin,
Wang Jiyang
Publication year - 2006
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200610747
Subject(s) - raman spectroscopy , crystal (programming language) , chemistry , absorption edge , infrared , phonon , crystal structure , barium , lattice (music) , materials science , optics , crystallography , band gap , optoelectronics , condensed matter physics , physics , inorganic chemistry , programming language , computer science , acoustics
Barium tungstate (BaWO 4 ) single crystal has been grown using Czochralski technique. It belongs to the scheelite structure, forming the space group I 4 1 / a at room temperature and the primitive cell contains two molecular units. The polarized Raman spectra were recorded by a micro‐Raman spectrophotometer system in the backscattering geometry. All the observed Raman modes were assigned. The Raman mode at 924 cm –1 , which belongs to the totally symmetrical A g optical modes, has the strongest intensity and its linewidth is 4.6 cm –1 . The infrared active lattice vibrations have been studied, eight optical modes were observed and assigned. The ultraviolet absorption edge is at 256 nm and the optical transparency range is up to 2500 nm at room temperature. The energy gap E g of this crystal was obtained from the optical transmission spectra. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)