Abstract
The formation of ferroelectric BaBi2Ta2O9 (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 degrees C. This temperature is about 150-200 degrees 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 (C)
2011 John Wiley & Sons, Ltd.
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