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

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Alicia Maria Manjón-Sanz
  • Jue Liu
  • Chaimae Babori
  • Mahmoud Barati
  • Frederick P. Marlton
  • Laurent Daniel
  • Mads Ry Vogel Jørgensen

Detail(s)

Original languageEnglish
Journal / PublicationJournal of the European Ceramic Society
Volume44
Issue number3
Online published31 Oct 2023
Publication statusPublished - Mar 2024

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 (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. © 2023 Elsevier Ltd

Research Area(s)

  • Antiferroelectric/ferroelectric, Neutron scattering, Pair distribution function, Phase transition

Citation Format(s)

Local structural mechanism for enhanced energy storage properties in heterovalent doped NaNbO3 ceramics. / Htet, Cho Sandar; Manjón-Sanz, Alicia Maria; Liu, Jue et al.
In: Journal of the European Ceramic Society, Vol. 44, No. 3, 03.2024.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review