Pandey, R., Narayan, B., Khatua, D.K. et al. (6 more authors) (2018) High electromechanical response in the non morphotropic phase boundary piezoelectric system PbTiO3-Bi(Zr1/2Ni1/2)O-3. Physical Review B, 97 (22). 224109. ISSN 2469-9950
Abstract
There is a general perception that a large piezoelectric response in ferroelectric solid solutions requires a morphotropic/polymorphic phase boundary (MPB/PPB), i.e., a composition driven interferroelectric instability. This correlation has received theoretical support from models which emphasize field driven polarization rotation and/or interferroelectric transformations. Here, we show that the ferroelectric system ( 1 − x ) PbTi O 3 − ( x ) Bi ( Zr 1 / 2 Ni 1 / 2 ) O 3 (PT-BNZ), which shows d 33 ( ∼ 400 p C / N ) comparable to the conventional MPB/PPB systems, does not belong to this category. In the unpoled state the compositions of PT-BNZ showing large d 33 exhibit a coexistence of tetragonal and cubiclike (CL) phases on the global length scale. A careful examination of the domain strucures and global structures (both in the unpoled and poled states) revealed that the CL phase has no symptom of average rhombohedral distortion even on the local scale. The CL phase is rather a manifestation of tetragonal regions of short coherence length. Poling increases the coherence length irreversibly which manifests as poling induced CL → P 4 m m transformation on the global scale. PT-BNZ is therefore qualitatively different from the conventional MPB piezoelectrics. In the absence of the composition and temperature driven interferroelectric instability in this system, polarization rotation and interferroelectric transformation are no longer plausible mechanisms to explain the large electromechanical response. The large piezoelectricity is rather associated with the increased structural-polar heterogeneity due to domain miniaturization without the system undergoing a symmetry change. Our study proves that attainment of large piezoelectricity does not necessarily require interferroelectric instability (and hence morphotropic/polymorphic phase boundary) as a criterion.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | ©2018 American Physical Society. This is an author produced version of a paper accepted for publication in Physical Review B. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Piezoelectricity; Ceramics; Ferroelectrics; Perovskite; Crystal structures; X-ray powder diffraction |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 08 Aug 2018 11:23 |
Last Modified: | 08 Aug 2018 11:26 |
Published Version: | https://doi.org/10.1103/PhysRevB.97.224109 |
Status: | Published |
Publisher: | American Physical Society |
Refereed: | Yes |
Identification Number: | 10.1103/PhysRevB.97.224109 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:134343 |