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Title: Microstructural evolution in NaNbO{sub 3}-based antiferroelectrics

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.
Authors:
;  [1] ;  [2]
  1. Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802 (United States)
  2. Taiyo Yuden Co., Ltd., Takasaki, Gunma 370-3347 (Japan)
Publication Date:
OSTI Identifier:
22492889
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CATIONS; CERAMICS; DOPED MATERIALS; ELECTRON DIFFRACTION; FERROELECTRIC MATERIALS; HYSTERESIS; MICROSTRUCTURE; OXYGEN; PHASE TRANSFORMATIONS; POLARIZATION; RARE EARTHS; STABILIZATION; SUPERLATTICES; TRANSMISSION ELECTRON MICROSCOPY; ZONES