Appropriate Value of Permittivity for Depolarization Field and Universal Instability of Insulating Ferroelectric Phase in Single-Domain State

作者：Watanabe Yukio^*

来源：Ferroelectrics, 2010, 406: 35-38.

DOI：10.1080/00150193.2010.484328

• Depolarization
• ferroelectric
• size
• instability
• field effect

We redefine the permittivity for the depolarization field and show that in most situations the permittivity for depolarization field should be unity, and show a proper expression for depolarization field. Based on this expression a generic consideration of ferroelectrics undergoing the first order transition shows that free standing two-dimensional ferroelectric phase cannot exist in a single domain state without a non-dielectric screening mechanism.

• 出版日期2010