ISSN:
1434-6036
Keywords:
PACS. 77.80.Bh Phase transitions and Curie point - 77.22.Gm Dielectric loss and relaxation - 78.30.-j Infrared and Raman spectra
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
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 / B g-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 .
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100510050430
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