Back to Search
Start Over
Origin of the large electrostrain in BiFeO3-BaTiO3 based lead-free ceramics
- Source :
- Wang, G & Hall, D 2019, ' Origin of the large electrostrain in BiFeO3-BaTiO3 based lead-free ceramics ', Journal of Materials Chemistry A, vol. 7, pp. 21254-21263 . https://doi.org/10.1039/C9TA07904A
- Publication Year :
- 2019
-
Abstract
- © 2019 The Royal Society of Chemistry. High electrostrain and breakdown strength (1 - x)BiFeO3-0.3BaTiO3-xNd(Li0.5Nb0.5)O3 (BF-BT-xNLN) ceramics were studied by in situ synchrotron X-ray diffraction (XRD) in combination with Rietveld refinement and conventional transmission electron microscopy. At zero field, compositions transformed from majority ferroelectric rhombohedral to pseudocubic as the NLN concentration increased, with 0.27% strain achieved at 60 kV cm-1 for x = 0.01. The large measured macroscopic strain was commensurate with peak shifting in XRD peak profiles, yielding 0.6% total strain at 150 kV cm-1. Strain anisotropy of ϵ200 > ϵ220 > ϵ111 was observed but despite the large applied field, no peak splitting was detected. We therefore concluded that the large electrostrain is not achieved through a conventional relaxor to field induced long-range ferroelectric transition. Instead, the data supports a model where local polar regions distort in the direction of the applied field within multiple local symmetries (pseudosymmetry) without long range correlation. We proposed that pseudosymmetry is maintained in BF-BT-xNLN even at high field (150 kV cm-1) due to the large ion radii mismatch and competing ionic/covalent bonding between Ba2+ and Bi3+ ions.
- Subjects :
- Diffraction
ResearchInstitutes_Networks_Beacons/02/06
Materials science
Ionic bonding
02 engineering and technology
electro-strain
Ion
chemistry.chemical_compound
synchrotron x-ray diffraction
Materials Science(all)
Energy(all)
piezoelectric ceramics
General Materials Science
Ceramic
Manchester Energy
Engineering(all)
Bismuth ferrite
Condensed matter physics
local polar distortion
Renewable Energy, Sustainability and the Environment
Rietveld refinement
ResearchInstitutes_Networks_Beacons/03/02
General Chemistry
021001 nanoscience & nanotechnology
bismuth ferrite
Ferroelectricity
chemistry
Transmission electron microscopy
visual_art
visual_art.visual_art_medium
0210 nano-technology
Advanced materials
Subjects
Details
- Language :
- English
- ISSN :
- 20507488
- Database :
- OpenAIRE
- Journal :
- Wang, G & Hall, D 2019, ' Origin of the large electrostrain in BiFeO3-BaTiO3 based lead-free ceramics ', Journal of Materials Chemistry A, vol. 7, pp. 21254-21263 . https://doi.org/10.1039/C9TA07904A
- Accession number :
- edsair.doi.dedup.....05ae466f7986ece4a6112a9f1e8810d3