Direct Observation of Stable Negative Capacitance in SrTiO3@BaTiO3 Heterostructure,Advanced Electronic Materials

当前位置： X-MOL 学术 › Adv. Electron. Mater. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Direct Observation of Stable Negative Capacitance in SrTiO3@BaTiO3 Heterostructure
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2019-12-16 , DOI: 10.1002/aelm.201901005
Zhongyang Wang _{1,

2} , Hongyu Li ₁ , Huiying Hu ₃ , Yuqi Fan ₄ , Runhua Fan ₅ , Baowen Li ₆ , Jiaoxia Zhang _{7,

8} , Hu Liu _{8,

9} , Jincheng Fan ₁₀ , Hua Hou ₁₁ , Feng Dang ₁ , Zongkui Kou ₂ , Zhanhu Guo ₈

Affiliation

Key Laboratory for Liquid‐Solid Structural Evolution & Processing of Materials (Ministry of Education)Shandong University Jinan 250061 P. R. China
Department of Materials Science and EngineeringNational University of Singapore Singapore 117574 Singapore
Department of PhysicsFriedrich Alexander University Erlangen‐Nürnberg Erlangen 91058 Germany
Institute of Environment and EcologyShandong Normal University Jinan 250014 P. R. China
College of Ocean Science and EngineeringShanghai Maritime University Shanghai 201306 P. R. China
School of Materials Science and EngineeringWuhan University of Technology Wuhan 430070 P. R. China
School of Materials Science and EngineeringJiangsu University of Science and Technology Zhenjiang 212003 P. R. China
Integrated Composites Laboratory (ICL)Department of Chemical & Biomolecular EngineeringUniversity of Tennessee Knoxville TN 37996 USA
National Engineering Research Centre for Advanced Polymer Processing TechnologyZhengzhou University Zhengzhou P. R. China
College of Materials Science and EngineeringChangsha University of Science and Technology Changsha 410114 P. R. China
School of Materials Science and EngineeringNorth University of China Taiyuan 030051 P. R. China

Negative capacitance in ferroelectrics has seem remarkable progress in recent years. However, direct measurement of negative capacitance has so far been a challenge due to its instable characteristic in the electrostatic field. An ingenious method to design stable negative capacitance by dielectric resonance under high‐frequency alternating electric fields is demonstrated. The well‐pronounced dielectric resonance and electrical property in BaTiO₃/SrTiO₃ (BT/ST) bulk ceramics consisted of epitaxial core–shell particles are studied. As the negative capacitance can be considered as an inductive behavior, the dielectric resonance of permittivity induced by a LC resonance can be occurred. The dielectric resonance can be described by the Lorentz model and explained by Fano‐like resonance of TO2 phonon in BT. In addition, lowest resonant frequency is observed at effective Curie temperature. Benefiting from negative capacitance in the BT/ST ceramics, both high permittivity and negative permittivity are accompanied with low losses around the resonant frequency, which is useful for developing capacitors and metamaterials. Significantly, this work will provide an initiative avenue to obtain explicit negative capacitance of ferroelectrics in the frequency spectrum.

中文翻译：

直接观察SrTiO3 @ BaTiO3异质结构中的稳定负电容

近年来，铁电体中的负电容似乎已取得显着进展。然而，由于负电容在静电场中的不稳定特性，迄今为止，直接测量负电容一直是一个挑战。演示了一种在高频交变电场下通过介电共振设计稳定负电容的巧妙方法。研究了由外延核-壳颗粒组成的BaTiO ₃ / SrTiO ₃（BT / ST）块状陶瓷中具有明显发音的介电共振和电性能。由于负电容可以被认为是一种电感行为，因此由LC引起的介电常数的介电共振可能会发生共振。介电共振可以用Lorentz模型来描述，而可以用BT中TO2声子的Fano类共振来解释。另外，在有效居里温度下观察到最低的谐振频率。得益于BT / ST陶瓷的负电容，高介电常数和负介电常数在谐振频率附近均具有低损耗，这对开发电容器和超材料非常有用。重要的是，这项工作将为获得频谱中铁电体的显性负电容提供一个主动途径。

更新日期：2020-02-13

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11