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Mechanism analyses of differential and static dielectric constants in ferroelectrics
Ferroelectrics Letters Section ( IF 0.4 ) Pub Date : 2020-03-26 , DOI: 10.1080/07315171.2020.1832393
Yong C. Gan 1 , Wan Q. Cao 2
Affiliation  

Abstract The dielectric constant measured by the LCR-meter is a differential-type, and is not equivalent to capacitivity. Capacitivity of ferroelectrics is the dielectric constant corresponding to electric hysteresis loop. Two kinds of dielectric constants are investigated based on the P-E loop mechanisms: turning effect of dipoles toward electric field direction, electric field-induced polarization effect, and dipole coupling effect. Numerical simulation of the theoretic equations exhibit adouble-peak of the differential dielectric constant, in which the distance between the two peaks depends on the temperature and the electric field. A much narrow static dielectric constant peak and negative peak appear corresponding to the loop. Mechanisms are analyzed schematically in detail. HIGHLIGHTS Definitions of differential- and static-dielectric constant are introduced and compared. Theoretic equations for the two dielectric constants are derived from the three effects. Variations of the two dielectric constants with E and T are demonstrated schematically. Mechanisms of the variations are explained in detail.

中文翻译:

铁电体微分介电常数和静态介电常数的机理分析

摘要 LCR表测量的介电常数是微分型的,并不等同于电容。铁电体的电容是对应于电滞回线的介电常数。基于PE回路机制研究了两种介电常数:偶极子向电场方向的转向效应、电场引起的极化效应和偶极子耦合效应。理论方程的数值模拟表现出微分介电常数的双峰,其中两个峰之间的距离取决于温度和电场。一个非常窄的静态介电常数峰值和负峰值对应于回路出现。详细地示意性地分析了机制。重点介绍并比较了微分介电常数和静态介电常数的定义。这两种介电常数的理论方程是从这三种效应推导出来的。两个介电常数随 E 和 T 的变化被示意性地展示。详细解释了这些变化的机制。
更新日期:2020-03-26
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