Article, 2024

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

Journal of the European Ceramic Society, ISSN 1873-619X, 0955-2219, Volume 44, 3, Pages 1597-1609, 10.1016/j.jeurceramsoc.2023.10.072

Contributors

Htet, Cho Sandar [1] Manjón-Sanz, Alicia María 0000-0002-7091-3484 [2] Liu, Jue 0000-0002-4453-910X [2] Babori, Chaimae 0000-0003-3742-0677 [3] [4] Barati, Mahmoud 0000-0003-1928-929X [3] [4] Marlton, Frederick P 0000-0001-9071-7109 [5] Daniel, Laurent 0000-0001-5016-4589 [3] [4] Jørgensen, Mads Ry Vogel 0000-0001-5507-9615 [6] [7] Pramanick, Abhijit 0000-0003-0687-4967 (Corresponding author) [1] [3] [4]

Affiliations

  1. [1] City University of Hong Kong
    2. [NORA names: China; Asia, East];
  2. [2] Oak Ridge National Laboratory
    3. [NORA names: United States; America, North; OECD];
  3. [3] Sorbonne Université, CNRS, Laboratoire de Génie Electrique et Electronique de Paris, 75252 Paris, France
    4. [NORA names: France; Europe, EU; OECD];
  4. [4] University of Paris-Saclay
    5. [NORA names: France; Europe, EU; OECD];
  5. [5] University of Technology Sydney
    6. [NORA names: Australia; Oceania; OECD];

Abstract

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. We show that Ca/Zr doping increases the average AFE phase (Pbma) fraction, however, the material remains as a composite of both FE (P21 ma) 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.

Keywords

AFE, AFE phase, AFE–FE, AFE–FE phase transition, Ca/Zr, Fe, Fe region, NaNbO3, NaNbO3 ceramics, NaNbO3-based ceramics, analysis, analysis of local structure, antiferroelectric (AFE)-ferroelectric, applications, average structure, boundary motion, center, ceramics, combination, composition, cost-effective, doped NaNbO3, doping, energy storage properties, energy-storage applications, enhanced energy storage properties, extension twinning, fraction, heterovalent substitution, increase, lead-free oxides, local structure, materials, mechanism, motion, neutron, neutron total scattering, oxidation, phase, phase transition, pinning centers, properties, region, scattering, storage properties, structural mechanics, structure, substitution, synthesis, total scattering, transition, twin boundary motion, years

Funders

  • Danish Ministry of Higher Education and Science
  • Oak Ridge National Laboratory
  • University Grants Committee
  • Office of Science

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