Abstract
In classical morphotropic piezoelectric materials, rhombohedral and tetragonal phase variants can energetically compete to form a mixed phase regime with improved functional properties. While the discovery of morphotropic-like phases in multiferroic BiFeO3 films has broadened this definition, accessing these phase spaces is still typically accomplished through isovalent substitution or heteroepitaxial strain which do not allow for continuous modification of phase composition postsynthesis. Here, we show that it is possible to use low-energy helium implantation to tailor morphotropic phases of epitaxial BiFeO3 films postsynthesis in a continuous and iterative manner. Applying this strain doping approach to morphotropic films creates a new phase space based on internal and external lattice stress that can be seen as an analogue to temperature-composition phase diagrams of classical morphotropic ferroelectric systems.
Original language | English |
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Pages (from-to) | 1033-1038 |
Number of pages | 6 |
Journal | Nano Letters |
Volume | 19 |
Issue number | 2 |
DOIs | |
State | Published - Feb 13 2019 |
Funding
This work was supported by the U.S. Department of Energy (DOE), Office of Science, Early Career Research Program, and Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. SHG work at the Iowa State University was supported by the Ames Laboratory, the U.S. DOE, Office of Science, Basic Energy Sciences, Materials Science and Engineering Division under contract DE-AC02-07CH11358. SHG modeling work by M.S.S. was from the support of the German National Academy of Sciences Leopoldina through Grant LPDS 2016-12. M.S.S. thanks Alberto de la Torre Duran for very useful SHG discussion. This research used resources of the Center for Nanophase Materials Sciences (Raman Spectroscopy), which is a DOE Office of Science User Facility.
Funders | Funder number |
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Materials Science and Engineering Division | |
U.S. DOE | |
U.S. Department of Energy | DE-AC02-07CH11358 |
U.S. Department of Energy | |
Office of Science | |
Basic Energy Sciences | |
Ames Laboratory | |
Division of Materials Sciences and Engineering | |
Deutsche Akademie der Naturforscher Leopoldina - Nationale Akademie der Wissenschaften | LPDS 2016-12 |
Deutsche Akademie der Naturforscher Leopoldina - Nationale Akademie der Wissenschaften |
Keywords
- Morphotropic phases
- ferroelectrics
- implantation
- metastability
- strain