Diamond Publications - Search Results

Search Again...

These results include publications that have not yet been reviewed and processed by Diamond Light Source. To view only processed publications click here.

You can use the folder icon under Actions to collate papers as required. You can then click on View Folder in the left-hand navigation to review and/or download your folder.

One item found (0 items not approved).

Instruments / Technical Area	Publication Details	Published	Actions
I11-High Resolution Powder Diffraction	Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze Sr2NaNb5O15 Jeremiah P. Tidey , Urmimala Dey , Ana M. Sanchez , Wei-Tin Chen , Bo-Hao Chen , Yu-Chun Chuang , Maria T. Fernandez-Diaz , Nicholas C. Bristowe , Richard Beanland , Mark S. Senn Communications Materials 5 DOI: 10.1038/s43246-024-00508-1 Diamond Proposal Number(s): [25166] Open Access Show Abstract ▼ 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. Here, 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.	May 2024

Instruments / Technical Area

Publication Details

Published

Actions

I11-High Resolution Powder Diffraction

Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze Sr2NaNb5O15

Jeremiah P. Tidey , Urmimala Dey , Ana M. Sanchez , Wei-Tin Chen , Bo-Hao Chen , Yu-Chun Chuang , Maria T. Fernandez-Diaz , Nicholas C. Bristowe , Richard Beanland , Mark S. Senn

Communications Materials 5

DOI: 10.1038/s43246-024-00508-1

Diamond Proposal Number(s): [25166]