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Raman and IR studies of BaBi 2 Ta 2 O 9 prepared by a sol–gel process
Author(s) -
Ma̧czka M.,
de Sousa Pinheiro G.,
Hermanowicz K.,
Freire P. T. C.,
Hanuza J.
Publication year - 2011
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.2858
Subject(s) - raman spectroscopy , orthorhombic crystal system , fluorite , phase (matter) , aurivillius , analytical chemistry (journal) , materials science , phonon , infrared spectroscopy , crystallography , infrared , ferroelectricity , chemistry , crystal structure , dielectric , optics , physics , condensed matter physics , optoelectronics , organic chemistry , metallurgy , chromatography
The formation of ferroelectric BaBi 2 Ta 2 O 9 (BBT) by a sol–gel process was studied by X‐ray, Raman and infrared (IR) spectroscopy. Our results show that the formation of a Bi‐layered phase proceeds via an intermediate fluorite‐type phase. This method allows obtaining a BBT phase already at 750 °C. This temperature is about 150–200 °C lower than that required in the conventional solid‐state reaction. Therefore, a material with smaller particle size can be obtained. Raman and IR studies of the obtained Bi‐layered phase show that phonon properties of the synthesized particles are slightly different from those of the bulk material due to the size effect, defects and weak changes in local order. Temperature dependence of Raman and IR wavenumbers is consistent with the orthorhombic distortion of the BBT structure. Copyright © 2011 John Wiley & Sons, Ltd.