Тип публикации: статья из журнала
Год издания: 2007
Идентификатор DOI: 10.1007/s10832-007-9015-8
Ключевые слова: Electrostatic problem, Homogenization, Local electric field, Nonlinear composite, Overall properties, Tunability, Composite materials, Computer simulation, Concentration (process), Electric field effects, Permittivity, Electrostatic problems, Local electric fields, Periodic structures
Аннотация: This paper addresses the rigorous treatment of the tunability effect (dc electric field driven variation of the permittivity) in a high-contrast two dimensional periodic composite (a matrix of a large dielectric constant ferroelectric material with linear dielectric inclusions). The theoretical analysis here shows that the trend esПоказать полностьюtablished for the case of low linear dielectric concentrations (that the dilution with a low permittivity dielectric does not result in decrease of the tunability of the composite material), can hold for appreciable dielectric concentrations. We have even documented a pronounced increase of the tunability. The results of our simulations are in qualitative agreement with the experimental data on the composite effect in ferroelectric/dielectric binary-phase systems. The result of the numerical analysis gives no support to the "decoupled approximation" in the effective medium approach often used for the description of the dielectric non-linearity of composites. © Springer Science+Business Media, LLC 2007.
Журнал: Journal of Electroceramics
Выпуск журнала: Vol. 18, Is. 1-2
Номера страниц: 129-137