Local structural mechanism for enhanced energy storage properties in heterovalent doped NaNbO3 ceramics
- City Univ. of Hong Kong, Kowloon (Hong Kong)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Univ. Paris-Saclay, Gif-sur-Yvette (France); Centre National de la Recherche Scientifique (CNRS) (France); Sorbonne Univ., Paris (France)
- Univ. of Technology Sydney, NSW (Australia)
- Aarhus Univ. (Denmark); Lund Univ. (Sweden)
- 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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