Anisotropic epitaxial stabilization of a low-symmetry ferroelectric with enhanced electromechanical response
Journal Article
·
· Nature Materials
- Univ. of New South Wales, Sydney, NSW (Australia)
- Univ. of Arkansas, Fayetteville, AR (United States)
- Monash Univ., Melbourne, VIC (Australia)
- Univ. of Arkansas, Fayetteville, AR (United States); Soochow University, Suzhou (China)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Here piezoelectrics interconvert mechanical energy and electric charge and are widely used in actuators and sensors. The best performing materials are ferroelectrics at a morphotropic phase boundary, where several phases coexist. Switching between these phases by electric field produces a large electromechanical response. In ferroelectric BiFeO3, strain can create a morphotropic-phase-boundary-like phase mixture and thus generate large electric-field-dependent strains. However, this enhanced response occurs at localized, randomly positioned regions of the film. Here, we use epitaxial strain and orientation engineering in tandem-anisotropic epitaxy-to craft a low-symmetry phase of BiFeO3 that acts as a structural bridge between the rhombohedral-like and tetragonal-like polymorphs. Interferometric displacement sensor measurements reveal that this phase has an enhanced piezoelectric coefficient of x2.4 compared with typical rhombohedral-like BiFeO3. Band-excitation frequency response measurements and first-principles calculations provide evidence that this phase undergoes a transition to the tetragonal-like polymorph under electric field, generating an enhanced piezoelectric response throughout the film and associated field-induced reversible strains. These results offer a route to engineer thin-film piezoelectrics with improved functionalities, with broader perspectives for other functional oxides.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- Australian Research Council (ARC); Defense Advanced Research Projects Agency (DARPA); National Natural Science Foundation of China; Natural Science Foundation of Jiangsu Province; USDOE Office of Science (SC)
- Grant/Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1844910
- Journal Information:
- Nature Materials, Journal Name: Nature Materials Journal Issue: 1 Vol. 21; ISSN 1476-1122
- Publisher:
- Springer Nature - Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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