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Phonon properties of nanosized bismuth layered ferroelectric material—Bi 2 WO 6
Author(s) -
Ma̧czka M.,
Macalik L.,
Hermanowicz K.,
Kȩpiński L.,
Tomaszewski P.
Publication year - 2010
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2526
Subject(s) - orthorhombic crystal system , crystallite , raman spectroscopy , materials science , transmission electron microscopy , bismuth , diffraction , phonon , crystallography , ferroelectricity , particle size , mineralogy , optics , crystal structure , condensed matter physics , nanotechnology , chemistry , dielectric , optoelectronics , physics , metallurgy
Nanosized Bi 2 WO 6 was synthesized by a mild hydrothermal crystallization process. This method allowed obtaining plate‐like crystallites of very small thickness (down to 3 nm). The effect of particle size on the structure and properties of Bi 2 WO 6 was studied by X‐ray diffraction (XRD), transmission electron microscopy, and Raman and infrared spectroscopies. It has been shown that the orthorhombic distortion decreases with decreasing particle size, but the structure of the smallest crystallites is still orthorhombic. Raman studies have also revealed a very strong intensity decrease for those modes that appear mainly for incident and scattered light polarized perpendicular to the layers. This behavior has been attributed to a decrease in the orthorhombic distortion and a plate‐like shape of the nanocrystallites. Copyright © 2009 John Wiley & Sons, Ltd.