Determination of Landau free-energy parameters by dielectric measurements in the ferroelectric TSCC
J Bornarel; V H Schmidt; J Bornarel; Univ. Scientifique et Medicale de Grenoble, Grenoble, France; V H Schmidt; Univ. Scientifique et Medicale de Grenoble, Grenoble, France
Журнал:
Journal of Physics C: Solid State Physics
Дата:
1981-05-20
Аннотация:
The authors measured the adiabatic dielectric permittivity epsilon <sub>b</sub> of tris-sarcosine calcium chloride (TSCC) at 400 Hz near the ferroelectric transition for DC bias fields up to 5000 V cm<sup>-1</sup>. They found epsilon <sub>infinity </sub>=4.2+or-0.2, Curie-Weiss constant C<sup>+</sup>=38.3+or-0.3K, T<sub>0</sub>=129.4+or-0.1K, and Landau coefficients A=(2.95+or-0.2)*10<sup>9</sup> V m A<sup>-1</sup> s<sup>-1</sup> K<sup>-1</sup> and B=(3.5+or-0.1)*10<sup>15</sup> V m<sup>5</sup> A<sup>-3</sup> s<sup>-3</sup>. They observed evidence of an internal bias field as reported previously by others.
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