期刊
NANO ENERGY
卷 79, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105423
关键词
Energy storage capacitors; Antiferroelectrics; In-situ synchrotron X-ray diffraction; Silver niobate
类别
资金
- Henry Royce Institute for Advanced Materials through the Engineering and Physical Sciences Research Council (EPSRC) [EP/R00661X/1, EP/S019367/1, EP/P02470X/1, EP/P025285/1]
- Science and Technology Program of Guangzhou [201704030095, EP/L017563/1, EP/N010493/1, EP/P015859/1]
- EPSRC [EP/L017563/1, EP/N010493/1, EP/P015859/1]
- Functional Materials and Devices group from The University of Sheffield
- EPSRC [EP/P02470X/1, EP/S019367/1] Funding Source: UKRI
The study on lead-free Ag1-3xNdxTayNb1-yO3 antiferroelectric ceramics reveals the changes in structure and performance characteristics with doping of Nd and Ta. The doped elements contribute to stabilizing the antiferroelectric structure, increasing the switching field, optimizing polarization, and enhancing energy storage density.
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.
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