Dimensionality crossover and the nonlinear dielectric response in betaine phosphate/arsenate mixed crystals

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Dielectric properties of quasi-one-dimensional hydrogen-bonded chains are studied for mixed crystals of antiferroelectric betaine phosphate and ferroelectric betaine arsenate at three different mixing concentrations, x = 0.1, 0.3, and 0.4 (x being the concentration of arsenate). For mixed crystals with x = 0.3 and 0.4 dielectric study revealed dimensionality crossover at around 82 K, where the quasi-one-dimensional nature was turned into three-dimensional Curie-Weiss behaviour on lowering the temperature, well above the antiferroelectric transition point. For x = 0.1 mixed crystal, on the other hand, the crossover point was almost coincident with the antiferroelectric transition point, showing still too-weak interchain coupling and strong one-dimensionality, almost to the point of antiferroelectric transition. For this system, the electric bias field effect revealed temperature-dependent nonlinearity of the dielectric constant, which may be ascribed to a development of competition between antiferroelectric and ferroelectric interchain couplings, the latter growing with increasing bias held and lowering temperature.
Publisher
IOP PUBLISHING LTD
Issue Date
1996-08
Language
English
Article Type
Article
Keywords

PHASE-TRANSITIONS; ARSENATE; (CH3)3NCH2COO.H3PO4; RELAXATION; BEHAVIOR

Citation

JOURNAL OF PHYSICS-CONDENSED MATTER, v.8, no.33, pp.6095 - 6103

ISSN
0953-8984
DOI
10.1088/0953-8984/8/33/016
URI
http://hdl.handle.net/10203/72737
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