Abstract
BCCD exhibits a sequence of structural phase transitions from a high-symmetryorthorhombic phase to different commensurate or incommensurate phases modulated along[001]. This work reports a study of the dielectric constant at a constant frequency of 10 kHzas a function of temperature. The results are discussed within the scope of Landau theoryand reveal the existence of new intermediate high-order commensurate phases, in agreementwith recent pyroelectric measurements.
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