Dielectric and Acoustic Properties of BPI1-x BPx (x = 0−0.1) Crystals in the Region of Antiferrodistortive and Ferroelectric Phase Transitions

Temperature dependence of the dielectric constant and longitudinal acoustic wave velocity were studied in betaine phosphite-betaine phosphate single crystals (BPI 1-x BP x : x = 0−0.1) in temperature regions of antiferrodistortive (T c1 ) and ferroelectric (T c2 ) phase transitions. The admixture of...

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Bibliographic Details
Published in:Ferroelectrics 2011-01, Vol.412 (1), p.59-73
Main Authors: Balashova, E. V., Lemanov, V. V.
Format: Article
Language:English
Subjects:
acoustic properties
Amino acid ferroelectrics
coupled order parameters
dielectric properties
phase transitions
thermodynamic theory
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Summary:Temperature dependence of the dielectric constant and longitudinal acoustic wave velocity were studied in betaine phosphite-betaine phosphate single crystals (BPI 1-x BP x : x = 0−0.1) in temperature regions of antiferrodistortive (T c1 ) and ferroelectric (T c2 ) phase transitions. The admixture of BP to BPI leads to increase of the antiferrodistortive phase transition temperature T c1 (x) (T c1 (0.1) = 360 K, T c1 (0) = 355 K) and decrease of the dielectric anomaly at T c1 (x). The nonlinear temperature dependence of the inverse dielectric constant in the antiferrodistortive phase, the electric field effect on the dielectric constant and acoustic anomalies at the ferroelectric phase transition are described in the frames of the Landau-Ginzburg-Devonshire-type thermodynamic model with the biquadratic coupling between nonpolar and polar order parameters.
ISSN:0015-0193
1563-5112
DOI:10.1080/00150193.2011.564528