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Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze, Sr2NaNb5O15
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Tidey, Jeremiah P., Dey, Urmimala, Sánchez, Ana M., Chen, Wei-Tin, Chen, Bo-Hao, Chuang, Yu-Chun, Fernandez-Diaz, Maria T., Bristowe, Nicholas C., Beanland, R. and Senn, Mark S. (2024) Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze, Sr2NaNb5O15. Communications Materials, 5 . 71. doi:10.1038/s43246-024-00508-1 ISSN 2662-4443.
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Official URL: https://doi.org/10.1038/s43246-024-00508-1
Abstract
The tetragonal tungsten bronze, Sr2NaNb5O15, shows promise for application in high-temperature high-efficiency capacitors vital for the sustainable energy revolution. Previously, the structural complexity of this and related materials has obscured the mechanisms underpinning two large anomalies in relative permittivity (εr) which give rise to their exceptionally broad dielectric response. We comprehensively investigate the structural evolution from −173 to 627 °C, combining electron, X-ray and neutron diffraction, electron microscopy, and first principles electronic structure calculations to unambiguously identify the structural origins of both anomalies. The peak in εr at 305 °C is associated with a polar-nonpolar phase transition, wherein cations displace along the c-axis. Guided by DFT, we identify a further transition upon cooling, associated with the second peak at −14 °C, linked to the softening of an in-plane polar distortion with a correlation length limited by ferroelastic nano-domains arising from rigid-unit-like tilting of NbO6 octahedra at high temperature, imparting relaxor-like behaviour. Thus, the two dielectric anomalies in Sr2NaNb5O15 are associated with two distinct crystallographic phase transitions and their interplay with a microstructure that arises from a third, non-polar structural distortion. Chemical control of these will enable development of tuneable materials with dielectric properties suitable for high-temperature energy storage applications.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QC Physics Q Science > QD Chemistry |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Science > Physics |
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Journal or Publication Title: | Communications Materials | ||||||
Publisher: | Nature Publishing Group UK | ||||||
ISSN: | 2662-4443 | ||||||
Official Date: | 7 May 2024 | ||||||
Dates: |
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Volume: | 5 | ||||||
Article Number: | 71 | ||||||
DOI: | 10.1038/s43246-024-00508-1 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Open Access (Creative Commons) | ||||||
Date of first compliant deposit: | 14 March 2024 | ||||||
Date of first compliant Open Access: | 8 May 2024 | ||||||
RIOXX Funder/Project Grant: |
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