Mechanism analyses of differential and static dielectric constants in ferroelectrics

IF 1.3 4区 物理与天体物理 Q4 PHYSICS, CONDENSED MATTER Ferroelectrics Letters Section Pub Date : 2020-03-26 DOI:10.1080/07315171.2020.1832393
Y. Gan, W. Cao
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引用次数: 1

Abstract

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.
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铁电体中微分和静态介电常数的机理分析
摘要LCR-meter测量的介电常数是微分型的,不等同于电容。铁电体的电容量是电滞回线对应的介电常数。基于P-E环机制研究了两种介电常数:偶极子向电场方向的转向效应、电场诱导极化效应和偶极子耦合效应。理论方程的数值模拟表明,微分介电常数存在双峰,双峰之间的距离与温度和电场有关。与回路相对应的静态介电常数峰和负峰较窄。并对其机理进行了详细的图解分析。重点介绍和比较了微分介电常数和静态介电常数的定义。根据这三种效应,导出了两个介电常数的理论方程。图解地说明了两个介电常数随E和T的变化。详细解释了这些变化的机理。
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来源期刊
Ferroelectrics Letters Section
Ferroelectrics Letters Section 物理-物理:凝聚态物理
CiteScore
1.10
自引率
0.00%
发文量
1
审稿时长
4.8 months
期刊介绍: Ferroelectrics Letters is a separately published section of the international journal Ferroelectrics. Both sections publish theoretical, experimental and applied papers on ferroelectrics and related materials, including ferroelastics, ferroelectric ferromagnetics, electrooptics, piezoelectrics, pyroelectrics, nonlinear dielectrics, polymers and liquid crystals. Ferroelectrics Letters permits the rapid publication of important, quality, short original papers on the theory, synthesis, properties and applications of ferroelectrics and related materials.
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