Phase transitions and low-frequency dielectric dispersion in ferroelectric Langmuir-Blodgett films of the copolymer vinylidene fluoride with trifluoroethyleneстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Авторы:
Palto S.P.,
Lotonov A.M. ,
Verkhovskaya K.A.,
Andreev G.N.,
Gavrilova N.D.
Журнал:
Journal of Experimental and Theoretical Physics
Том:
90
Номер:
2
Год издания:
2000
Издательство:
Maik Nauka/Interperiodica Publishing
Местоположение издательства:
Russian Federation
Первая страница:
301
Последняя страница:
307
Аннотация:
The dielectric properties of multilayer ferroelectric Langmuir-Blodgett films based on the copolymer vinylidene fluoride with trifluoroethylene with 70/30 composition are investigated. Good agreement with theoretical models on the basis of the phenomenological Landau-Ginzburg approach is demonstrated for the first time for ultrathin films. Expressions describing the temperature variation of the permittivity in the temperature range of hysteresis and giving quantitative agreement with experimental data are obtained. It is shown that the Langmuir-Blodgett films are conducting. This conductivity does not depend on the frequency of the field. The results are explained by the fact that the motion of charge in the films is not bounded by domain walls. The jumps observed in the frequency dispersion at volume and low-temperature (surface) phase transitions are explained by a sharp increase in the relaxation times at the transition into the ferroelectric state. © 2000 MAIK "Nauka/Interperiodica".
Добавил в систему:
Гаврилова Надежда Дмитриевна