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

被引:231
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
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
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页数:8
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