Proper Permittivity for Depolarization Field in Perfectly Insulating Ferroelectric and Examination of Background Permittivity

Proper Permittivity for Depolarization Field in Perfectly Insulating Ferroelectric and Examination of Background Permittivity
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完美绝缘铁电体去极化场的适当介电常数及背景介电常数的检验

DOI:
10.1080/00150193.2014.889540
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发表时间:
2014
期刊:
影响因子:
0.8
通讯作者:
Y. Watanabe
Y. Watanabe
中科院分区:
材料科学4区
文献类型:
--
作者:
Y. Watanabe;Y. Urakami;D. Matsumoto;S. Kaku;S.-W. Cheong;G. A. Thomas and S. Miyauchi;Y. Watanabe

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自发极化产生的退极化场被认为在铁电体的特性中起着重要的作用。对于Ed的估计,正确dc-permittivityϵdis是必要的,但仍是一个有争议的问题,如背景permittivityϵb。本文考察了permittivityϵdin一维绝缘单畴铁电的情况,通过注意thatϵddepends如何定义psi。这个检查显示thatϵdshould是统一的实验psi或自洽psi使用。在不依赖特殊理论的情况下,基于这一结果的一般考虑表明具有一阶铁电跃迁的一维绝缘单畴铁电在热力学上不可能存在。
Depolarization field Edemerging from spontaneous polarizationPSis considered to play an essential role in the characteristics of ferroelectrics. For the estimation of Ed, correct dc-permittivityϵdis necessary but is still a controversial issue such as background permittivityϵb. This paper examines the permittivityϵdin the case of 1-dimensional insulating single-domained ferroelectric, by noting thatϵddepends on howPSis defined. This examination shows thatϵdshould be unity when experimentalPSor self-consistentPSis used. Without relying on special theories, a generic consideration based on this results shows that 1-dimensional insulating single-domained ferroelectric having 1st order ferroelectric transition cannot exist thermodynamically.
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