Dielectric dispersion and phase transitions in vinylidene fluoride-trifluoroethylene copolymer ferroelectric filmsстатья
Информация о цитировании статьи получена из
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Местоположение издательства:Road Town, United Kingdom
Первая страница:942
Последняя страница:945
Аннотация:Dielectric properties and phase transitions in bulk films of ferroelectric vinylidene fluoride-trifluoroethylene copolymers of different composition (75 : 25, 60 : 40, 55 : 45) were studied. The samples were prepared by spin-coating from solution. In films of 55 : 45 composition, a second-order phase transition was observed. The samples of 75 : 25 and 60 : 40 composition exhibit the first-order phase transitions. Ultrathin films with a composition of 55 : 45 and a thickness of 50 Å (∼10 monolayers) were obtained by the Langmuir-Blodgett method. In contrast to bulk films, Langmuir-Blodgett films exhibit the first-order phase transition with hysteresis and shift of the phase transition point to high temperatures. Probably, this is associated with the high crystallinity of Langmuir-Blodgett films.