Domain Wall Motions in a Near-Morphotropic Pb(Zr,Ti)O3 Under Mechanical Stress Observed by In Situ Piezoresponse Force Microscopy
| Autor: | Kwanlae Kim |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Piezoelectric coefficient
Materials science 020502 materials Ferroelectric ceramics Metals and Alloys 02 engineering and technology 021001 nanoscience & nanotechnology Ferroelectricity Surfaces Coatings and Films Electronic Optical and Magnetic Materials Hysteresis Piezoresponse force microscopy Domain wall (magnetism) 0205 materials engineering Modeling and Simulation Grain boundary Composite material 0210 nano-technology Electron backscatter diffraction |
| Zdroj: | Korean Journal of Metals and Materials. 57:38-42 |
| ISSN: | 2288-8241 1738-8228 |
| DOI: | 10.3365/kjmm.2019.57.1.38 |
| Popis: | Many important material properties of ferroelectric ceramics such as piezoelectric coefficient and hysteresis curve are governed by domain structures and their evolution processes. In the present work, domain wall motions in a near-morphotropic Pb(Zr,Ti)O3 under an external compressive stress were observed using in situ piezoresponse force microscopy (PFM). This specific PZT material was chosen due to its complex microstructure, which originates from the coexistence of tetragonal and rhombohedral phases. A micromechanical test rig was installed on the sample stage controller, enabling precise control of the sample position. For the real-time strain monitoring of the PZT sample, a strain gauge was attached to the sample surface on which the PFM scan was conducted. In addition, analysis of the ferroelectric domain structure was assisted by using the electron backscatter diffraction (EBSD) technique to identify the habit planes of non- 180° domain walls and grain boundaries in the PFM images. From a certain grain, a set of large non-180° needle-like domain patterns in the (101) plane were observed before applying a mechanical stress. With increasing compressive stress levels, another set of non-180° needle-like domain patterns grew in the (011) plane, overwriting the domain patterns in the (101) plane. This indicates that polarization switching processes in ferroelectric ceramics take place via a pattern evolution based on the pre-existing domain patterns. (Received October 22, 2018; Accepted November 19, 2018) |
| Databáze: | OpenAIRE |
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