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

DOI: 10.1016/j.nanoen.2020.105423

Authors: Zhilun Lu (University of Sheffield; The Henry Royce Institute) , Weichao Bao (Shanghai Institute of Ceramics) , Ge Wang (University of Sheffield) , Shikuan Sun (University of Sheffield) , Linhao Li (University of Sheffield) , Jinglei Li (Xi'an Jiaotong University) , Huijing Yang (University of Sheffield; Tangshan Normal University) , Hongfen Ji (University of Sheffield; Xi'an Technological University) , Antonio Feteira (Sheffield Hallam University) , Dejun Li (Tianjin Normal University) , Fangfang Xu (Shanghai Institute of Ceramics) , Annette K. Kleppe (Diamond Light Source) , Dawei Wang (University of Sheffield) , Shi-Yu Liu (Tianjin Normal University) , Ian M. Reaney (University of Sheffield)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nano Energy

State: Published (Approved)
Published: September 2020
Diamond Proposal Number(s): 21714

Abstract: The mechanisms underpinning high energy storage 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 stabilise 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. Pmax is optimised 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 Wrec = 6.5 J cm-3 for Ag0.97Nd0.01Ta0.20Nb0.80O3.

Journal Keywords: Energy storage capacitors; Antiferroelectrics; In-situ synchrotron X-ray; Silver niobate

Diamond Keywords: Antiferroelectricity

Subject Areas: Materials, Physics, Energy


Instruments: I15-Extreme Conditions

Added On: 05/10/2020 09:40

Documents:
1-s2.0-S2211285520310004-main.pdf

Discipline Tags:

Energy Storage Quantum Materials Hard condensed matter - electronic properties Energy Ceramics Physics Materials Science

Technical Tags:

Diffraction