Understanding ultrahigh dielectric response in tricritical ferroelectrics

扫码查看

原文链接

NETL

外文摘要：Ferroelectric material exhibits large dielectric response owing to its peculiar polarization states， which has been found a variety of applications on electrical power equipment and high-tech products。 Very recent investigations reported that ultrahigh dielectric permittivity occurs at the tricritical triple point (TTP for short) of ferroelectrics。 However， the reason is unclear and there is still lack of theoretical explanation。 Here， Landau model is employed to investigate the mechanism of enhanced dielectric response regarding thermodynamically tricritical phenomenon。 The six-order Landau-Devonshire polynomial is used to calculate the intrinsic dielectric permittivity which is mainly caused by lattice deformation。 Then the Landau-Ginzburg expression is applied to study the width and energy of ferroelectric domain walls around the TTP， which determines the extrinsic dielectric response induced by the movement of domain walls。 As a result， the intrinsic and extrinsic dielectric responses are both enhanced approaching to TTP， which leads to the ultrahigh dielectric permittivity for tricritical ferroelectrics。

外文关键词：

DielectricsPermittivityPolarizationThermodynamicsCeramicsFerroelectric materialsLattices

作者：

Yan Wang、Zhixin He、Yongbin Liu、Yuting He、Ruifeng Yao、Wenbo Yan、Xinghao Hu、Jinghui Gao、Lisheng Zhong

展开 >

作者单位：

State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, Xi'an, 710049, China

会议名称：

International Conference on the Properties and Applications of Dielectric Materials

会议地点：

Xi'an(CN)

会议母体文献：

2018 12th International Conference on the Properties and Applications of Dielectric Materials

页码：

245-248

出版时间：

2018

DOI：

10.1109/ICPADM.2018.8401256