کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1809944 1525225 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The thickness dependence of the phase transition temperature in PVDF
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
The thickness dependence of the phase transition temperature in PVDF
چکیده انگلیسی

It was found recently that in the Langmuir–Blodgett ultrathin vinylidene fluoride (PVDF) films there is ferroelectric phase transition of the first order. Earlier in the bulk PVDF this phase transition was not observed because the melting temperature of this ferroelectric polymer (∼170 °C) is lower than the point of the possible phase transition. Therefore this polymer was treated for a long time as pyroelectric. In the present work we investigate PVDF Langmuir–Blodgett films at the nanoscale and the film thickness interval, where ferroelectric phase transition disappears and transition from ferroelectric to pyroelectric state takes place. This phenomenon is explained by the finite-size effect at the nanoscale using Landau–Ginzburg–Devonshire (LGD) theory and by the Weiss mean field model.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 421, 15 July 2013, Pages 23–27
نویسندگان
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