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Abstract
Dielectric and Raman spectroscopic measurements have been performed to investigate the ferroelectric phase transition in \(\). Single crystals were grown by the zone melting method. The frequency dependence of the dielectric permittivity from 1 MHz to 1 GHz has been studied in a temperature range between 265 and 285 K. A Debye like dielectric dispersion was found, showing a critical slowing down around \(\) K. Polarized Raman spectra have been taken between 220 and 310 K. Two softening modes have been found, one of A- and another one of B/Bg-symmetry. The phase transition mechanism in \(\) can be classified as partially order-disorder and partially displacive, confirming former structural results. It resembles strongly that of monoclinic \(\).
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