Microstructural evolution in NaNbO{sub 3}-based antiferroelectrics
- Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
- Taiyo Yuden Co., Ltd., Takasaki, Gunma 370-3347 (Japan)
Our recent study found that CaZrO{sub 3} doping can effectively enhance the antiferroelectric P phase in NaNbO{sub 3} ceramics, leading to a double polarization hysteresis loop characteristic of a reversible antiferroelectric ↔ ferroelectric phase transition [Shimizu et al., Dalton Trans. 44, 10763 (2015)]. Here, a thorough transmission electron microscope study was performed to illustrate the CaZrO{sub 3} doping-assisted antiferroelectricity stabilization. In parallel to the bright-field imaging and selected area electron diffraction from multiple zone axes, detailed dark-field imaging was utilized to determine the superlattice structural origins, from either oxygen octahedral tilting or antiparallel cation displacements. By analogy with Pb(Zr{sub 1−x}Ti{sub x})O{sub 3} and rare-earth doped BiFeO{sub 3} systems, the chemical substitutions are such as to an induced polar-to-antipolar transition that is consistent with a tolerance factor reduction. The resultant chemical pressure has a similar effect to the compressive hydrostatic pressure where the antiferroelectric state is favored over the ferroelectric state.
- OSTI ID:
- 22492889
- Journal Information:
- Journal of Applied Physics, Vol. 118, Issue 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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