Dielectric constant and phase transition sequence in betaine calcium chloride dihydrate
J L Ribeiro; M R Chaves; A Almeida; J Albers; A Kloepperpieper; H E Mueser; J L Ribeiro; Centro de Fisica, Porto Univ., Inst. Nacional de Investigacao Cientifica, Portugal; M R Chaves; Centro de Fisica, Porto Univ., Inst. Nacional de Investigacao Cientifica, Portugal; A Almeida; Centro de Fisica, Porto Univ., Inst. Nacional de Investigacao Cientifica, Portugal; J Albers; Centro de Fisica, Porto Univ., Inst. Nacional de Investigacao Cientifica, Portugal; A Kloepperpieper; Centro de Fisica, Porto Univ., Inst. Nacional de Investigacao Cientifica, Portugal; H E Mueser; Centro de Fisica, Porto Univ., Inst. Nacional de Investigacao Cientifica, Portugal
Журнал:
Journal of Physics: Condensed Matter
Дата:
1989-10-30
Аннотация:
BCCD exhibits a sequence of structural phase transitions from a high-symmetry orthorhombic 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 kHz as a function of temperature. The results are discussed within the scope of Landau theory and reveal the existence of new intermediate high-order commensurate phases, in agreement with recent pyroelectric measurements.
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