Abstract
The room temperature phonon modes of both the alkali metal doped and
pure CON (CaxBa1-x,Nb2O6) crystals were determined using the Raman
scattering technique. Owing to the intrinsic disorder of the tetragonal
lattice we observe few and broad bands. The wavenumber of the internal
modes observed shifts upwards when the volume of the unit cell
increases. This blue shift is likely to be related to the closer packing
of the NbO6 octahedrons. The Curie temperatures of the ferroelectric to
paraelectric phase transition for the CBN-like crystals were obtained
from DSC measurements. The Raman spectra of CBN32 in the temperature
range from 300 to 568 K were also recorded in order to investigate the
phase transformation. (C) 2011 Elsevier B.V. All rights reserved.
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