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Stress-induced R-M_{A}-M_{C}-T symmetry changes in BiFeO_{3} films
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Christen, Hans M., Nam, J., Kim, H., Hatt, A. and Spaldin, N. (2011) Stress-induced R-M_{A}-M_{C}-T symmetry changes in BiFeO_{3} films. Physical Review B (Condensed Matter and Materials Physics), Vol.83 (No.14). article no. 144107 . doi:10.1103/PhysRevB.83.144107 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.83.144107
Abstract
Recent reports on epitaxial BiFeO(3) films show that the crystal structure changes from nearly rhombohedral ("R like") to nearly tetragonal ("T like") at strains exceeding approximate to-4.5%, with the T-like structure being characterized by a highly enhanced c/a ratio. While both the R-like and the T-like phases are monoclinic, our detailed x-ray diffraction results reveal a symmetry change from M(A) and M(C) type, respectively, at this R-like-to-T-like transition. Therefore, the ferroelectric polarization is confined to different (pseudocubic) planes in the two phases. By applying additional strain or by modifying the unit-cell volume of the film by substituting Ba for Bi, the monoclinic distortion in the T-like MC phase is reduced, i.e., the system approaches a true tetragonal symmetry. Therefore, in going from bulk to highly strained films, a phase sequence of rhombohedral (R)-to-monoclinic (R-like M(A))-to-monoclinic (T-like M(C))-to-tetragonal (T) is observed. This sequence is otherwise seen only near morphotropic phase boundaries in lead-based solid-solution perovskites (i.e., near a compositionally induced phase instability), where it can be controlled by electric field, temperature, or composition. Our results now show that this evolution can occur in a lead-free, stoichiometric material and can be induced by stress alone.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||
| Publisher: | American Physical Society | ||||
| ISSN: | 1098-0121 | ||||
| Official Date: | 2011 | ||||
| Dates: |
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| Volume: | Vol.83 | ||||
| Number: | No.14 | ||||
| Page Range: | article no. 144107 | ||||
| DOI: | 10.1103/PhysRevB.83.144107 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Funder: | U.S. Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division , Republic of Korea, Ministry of Knowledge and Economy , Visiting Scientists Program , US Department of Energy , NSF , UC Santa Barbara under NSF | ||||
| Grant number: | IAN:16B642601 (Visiting Scientists Program) ; DMR-0820404 NIRT-0609377 (NSF) ; CHE-0321368 (UC Santa Barbara under NSF ) |
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