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

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...

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Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 44; no. 3; pp. 1597 - 1609
Main Authors Htet, Cho Sandar, Manjón-Sanz, Alicia Maria, Liu, Jue, Babori, Chaimae, Barati, Mahmoud, Marlton, Frederick P., Daniel, Laurent, Jørgensen, Mads Ry Vogel, Pramanick, Abhijit
Format Journal Article
LanguageEnglish
Published 01.03.2024
Subjects
Antiferroelectric/ferroelectric
Condensed Matter Physics
Den kondenserade materiens fysik
Fysik
Natural Sciences
Naturvetenskap
Neutron scattering
Pair distribution function
Phase transition
Physical Sciences
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Summary: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.
ISSN:0955-2219
DOI:10.1016/j.jeurceramsoc.2023.10.072