Mechanism of enhanced energy storage density in AgNbO3-based lead-free antiferroelectrics

被引：244

作者：

Lu, Zhilun ^{[1
,2
]}

Bao, Weichao ^{[3
]}

Wang, Ge ^{[1
]}

Sun, Shi-Kuan ^{[1
]}

Li, Linhao ^{[1
]}

Li, Jinglei ^{[4
,5
]}

Yang, Huijing ^{[1
,6
]}

Ji, Hongfen ^{[1
,7
]}

Feteira, Antonio ^{[8
]}

Li, Dejun ^{[9
]}

Xu, Fangfang ^{[3
]}

Kleppe, Annette K. ^{[10
]}

Wang, Dawei ^{[1
]}

Liu, Shi-Yu ^{[9
]}

Reaney, Ian M. ^{[1
]}

机构：

[1] Univ Sheffield, Dept Mat Sci & Engn, Sheffield S1 3JD, S Yorkshire, England

[2] Henry Royce Inst, Sir Robert Hadfield Bldg, Sheffield S1 3JD, S Yorkshire, England

[3] Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China

[4] Xi An Jiao Tong Univ, Key Lab, Elect Mat Res Lab, Minist Educ, Xian 710049, Shaanxi, Peoples R China

[5] Xi An Jiao Tong Univ, Int Ctr Dielect Res, Xian 710049, Shaanxi, Peoples R China

[6] Tangshan Normal Univ, Dept Phys, Tangshan 063000, Peoples R China

[7] Xian Technol Univ, Lab Thin Film Tech & Opt Test, Xian 710032, Peoples R China

[8] Sheffield Hallam Univ, Mat & Engn Res Inst, Sheffield S1 1WB, S Yorkshire, England

[9] Tianjin Normal Univ, Coll Phys & Mat Sci, Tianjin 300387, Peoples R China

[10] Diamond Light Source Ltd, Harwell Sci & Innovat Campus, Didcot OX11 0DE, Oxon, England

来源：

NANO ENERGY | 2021年 / 79卷

基金：

英国工程与自然科学研究理事会;

关键词：

Energy storage capacitors; Antiferroelectrics; In-situ synchrotron X-ray diffraction; Silver niobate; RELAXOR FERROELECTRIC CERAMICS; SILVER NIOBATE; DIELECTRIC-PROPERTIES; PERFORMANCE; TEMPERATURE; MULTILAYERS; CAPACITORS; MICROSTRUCTURE; TRANSITIONS; STABILITY;

D O I：

10.1016/j.nanoen.2020.105423

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The mechanisms underpinning high energy storage density in lead-free Ag1-3xNdxTayNb1-yO3 antiferroelectric (AFE) ceramics have been investigated. Rietveld refinements of in-situ synchrotron X-ray data reveal that the structure remains quadrupled and orthorhombic under electric field (E) but adopts a non-centrosymmetric space group, Pmc21, in which the cations exhibit a ferrielectric configuration. Nd and Ta doping both stabilize the AFE structure, thereby increasing the AFE-ferrielectric switching field from 150 to 350 kV cm(-1). Domain size and correlation length of AFE/ferrielectric coupling reduce with Nd doping, leading to slimmer hysteresis loops. The maximum polarization (P-max) is optimized through A-site aliovalent doping which also decreases electrical conductivity, permitting the application of a larger E. These effects combine to enhance energy storage density to give W-rec = 6.5 J cm(-3) for Ag0.97Nd0.01Ta0.20Nb0.80O3.

引用

页数：8

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