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Hierarchical domain structures associated with oxygen octahedra tilting patterns in lead-free (Bi1/2Na1/2)TiO3

Journal Article · · Nanotechnology
 [1];  [2];  [3];  [3];  [4];  [2];  [5];  [2];  [6]
  1. Argonne National Laboratory (ANL), Argonne, IL (United States); Shanghai University (SHU) (China)
  2. Iowa State Univ., Ames, IA (United States)
  3. West Chester University of Pennsylvania, PA (United States)
  4. Argonne National Laboratory (ANL), Argonne, IL (United States); Chinese Academy of Sciences (CAS), Beijing (China)
  5. Shanghai University (SHU) (China)
  6. Argonne National Laboratory (ANL), Argonne, IL (United States)
Hierarchical domain structures associated with oxygen octahedra tilting patterns were observed in lead-free (Bi1/2Na1/2)TiO3 ceramics using aberration-corrected high-resolution transmission electron microscopy (HRTEM). Three types of domains are induced by distinct mechanisms: the 'orientation-domain' is induced at micrometer scale formed by different tilting orientations of the oxygen octahedra, the 'meso-chemical-domain' occurs at a few tens of nanometer scale by chemical composition variation on the A-site in the ABO3 perovskite structure, and the 'nano-cluster-region' runs across several unit-cells with apparent A-site cation segregation with oxygen vacancies clustering around Na cations. Based on HRTEM amplitude contrast imaging (ACI), the correlation between the oxygen octahedral tilting pattern and compositional non-stoichiometry was established. The role of the hierarchical domain structure associated with the tilting patterns of the oxygen octahedra on the ferroelectric behavior of (Bi1/2Na1/2)TiO3 is also discussed.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2348899
Journal Information:
Nanotechnology, Journal Name: Nanotechnology Journal Issue: 7 Vol. 34; ISSN 0957-4484
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

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