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Title: Direct evidence of an incommensurate phase in NaNbO{sub 3} and its implication in NaNbO{sub 3}-based lead-free antiferroelectrics

Hot-stage in situ transmission electron microscopy was employed to investigate the temperature-induced complex sequence of phase transitions in NaNbO{sub 3} polycrystalline. In addition to the commonly recognized P (Pbma) → R (Pmnm) → S (Pnmm) phase transitions, incommensurate phases were observed to exist in P and R phase regions. The former (in the P → R transition region) is coincident with a diffused dielectric peak appearing at ∼170 °C, and the latter (in the R → S transition region) serves as an intermediate structure to bridge the two sub-phases in the R phase region. The incommensurate phase in the P phase region can be inferred from the polarization current density and differential dielectric permittivity anomalies, and it provides the bridge structure during the electric field-induced polarization reversal and antiferroelectric-to-ferroelectric transition in NaNbO{sub 3} solid solutions.
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:
22482091
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CURRENT DENSITY; ELECTRIC FIELDS; FERROELECTRIC MATERIALS; INTERMEDIATE STRUCTURE; PEAKS; PERMITTIVITY; PHASE TRANSFORMATIONS; POLARIZATION; POLYCRYSTALS; SOLID SOLUTIONS; TRANSMISSION ELECTRON MICROSCOPY