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Title: Structure and ferroelectricity of nonstoichiometric (Na{sub 0.5}Bi{sub 0.5})TiO{sub 3}

Stoichiometric (Na{sub 0.5}Bi{sub 0.5})TiO{sub 3} (NBT) adopts the ABO{sub 3} perovskite structure with the A-site equally occupied by Na{sup +} and Bi{sup 3+} ions. However, non-stoichiometric compositions can be synthesized intentionally or unintentionally. To determine the effect of A-site nonstoichiometry on the crystal structure and ferroelectricity of NBT, the composition of (Na{sub 0.5−x}Bi{sub 0.5+x})TiO{sub 3+x} was varied using x = −0.01, −0.005, 0, 0.005, and 0.01. High resolution synchrotron x-ray diffraction and Rietveld refinement revealed that a shift in either direction from x = 0 results in a decrease in the spontaneous ferroelastic strain. Ferroelectric hysteresis and piezoelectric coefficients were found to be optimum in the stoichiometric composition.
Authors:
 [1] ;  [1] ;  [2] ; ; ;  [1] ;  [3] ;  [4]
  1. Department of Materials Science and Engineering, University of Florida, Gainesville, Florida 32611 (United States)
  2. (Japan)
  3. (United States)
  4. Department of Physical Chemistry, University of Science and Technology Beijing, Beijing 100083 (China)
Publication Date:
OSTI Identifier:
22257707
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 11; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BISMUTH IONS; CRYSTAL STRUCTURE; FERROELECTRIC MATERIALS; PEROVSKITE; SODIUM IONS; STOICHIOMETRY; TITANATES; TITANIUM OXIDES; X-RAY DIFFRACTION