Abstract
This paper reports a detailed investigation of the low frequency dielectric relaxation ofbetaine arsenate near the ferroelectric phase transition. The dielectric relaxation data arecomplemented with polarized infrared reflectivity data taken at low temperatures. Thereported results allow us to identify several low frequency modes that clarifythe complex behaviour of the dielectric response near the Curie temperatureTc2≈120 K. It is suggested that the important slow dynamics observed is linked to the reorientationof the betaine molecular group. The roles of the different molecular units in the structuralchanges are briefly discussed and a new and more complex phase transition sequence isproposed.
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