期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 105, 期 5, 页码 3581-3589出版社
WILEY
DOI: 10.1111/jace.18315
关键词
electro-mechanical properties; piezoelectric materials; properties; polycrystalline materials; relaxors; x-ray methods
资金
- DMTC Limited (Australia)
- Thales Australia
Crystallographic texturing of ferroelectrics can enhance their piezoelectric response. This study observed the ferroelastic self-poling effect in a crystallographically textured ceramic. The introduction of BaTiO3 platelet templates induced the alignment of ferroelastic domains. The in-situ high-energy x-ray diffraction revealed the strain mechanisms and showed a contrast in strain magnitudes between the textured and untextured ceramics.
Crystallographic texturing of ferroelectrics is known to improve the piezoelectrics response due to the alignment of optimal grain orientations in polycrystalline materials. Using high-energy x-ray diffraction, a ferroelastic self-poling effect was observed in crystallographically textured 0.68 Pb(Mg1/3Nb2/3)O-3- 0.32PbTiO(3) ceramic. It is shown that the BaTiO3 platelet templates used to induce crystallographic texture imposed a biaxial strain causing ferroelastic domains to re-orient parallel to the template plate normal. In-situ high-energy x-ray diffraction was then used to characterize the response mechanisms of the material with applied electric fields. The textured ceramic produced a (111) lattice strain of 0.13% in the remanent state, and a 0.16% (111) unipolar lattice strain at 2 kV/mm while the untextured ceramic had a higher (111) lattice strain of 0.18% in the remanent state and a smaller (111) unipolar lattice strain at 2 kV/mm of 0.096%. This contrast in the strain magnitudes can be linked to the self-poling effect. A strain mechanism incorporating the self-poling effect is proposed, furthering our understanding of how crystallographic texture impacts the piezoelectric properties and providing a pathway for engineering the self-poling effect to further enhance material response.
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