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Title: Local structural mechanism for enhanced energy storage properties in heterovalent doped NaNbO3 ceramics

Journal Article · · Journal of the European Ceramic Society
 [1];  [2]; ORCiD logo [2];  [3]; ORCiD logo [3];  [4]; ORCiD logo [3];  [5]; ORCiD logo [6]
  1. City Univ. of Hong Kong, Kowloon (Hong Kong)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  3. Univ. Paris-Saclay, Gif-sur-Yvette (France); Centre National de la Recherche Scientifique (CNRS) (France); Sorbonne Univ., Paris (France)
  4. Univ. of Technology Sydney, NSW (Australia)
  5. Aarhus Univ. (Denmark); Lund Univ. (Sweden)
  6. City Univ. of Hong Kong, Kowloon (Hong Kong); Univ. Paris-Saclay, Gif-sur-Yvette (France); Centre National de la Recherche Scientifique (CNRS) (France); Sorbonne Univ., Paris (France)

In recent years, there is a growing interest for new lead-free oxides with reversible antiferroelectric (AFE)-ferroelectric (FE) phase transition for high-power energy-storage applications. NaNbO3-based ceramics are particularly attractive due to their easy synthesis and cost-effectiveness. In order to stabilize reversible AFE-FE phase transition, NaNbO3 is doped with a combination of heterovalent substitutions, although the underlying structural mechanism for the same is poorly understood. Here, we investigated local and average structures of Ca/Zr doped NaNbO3 using neutron total scattering. Here, we show that Ca/Zr doping increases the average AFE phase (Pbma) fraction, however, the material remains as a composite of both FE (P21ma) and AFE regions. Analysis of local structure suggests that increase in the long-range AFE phase results from more extensive twinning of local FE regions, due to introduced charge disorder. We propose that enhanced energy-storage properties of Ca/Zr-doped NaNbO3 arises from localized twin boundary motion between the defect-induced pinning centers.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2283818
Journal Information:
Journal of the European Ceramic Society, Vol. 44, Issue 3; ISSN 0955-2219
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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