New directions in high temperature dielectrics: unlocking performance of doped tungsten bronze oxides through mechanistic understanding
Lead Research Organisation:
University of Warwick
Department Name: Physics
Abstract
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Publications
Beanland R
(2024)
Superstructure reflections in tilted perovskites
in Acta Crystallographica Section A Foundations and Advances
Beanland R
(2023)
Temperature dependence of incommensurate modulation in Ca0.28Ba0.72Nb2O6
in Journal of Applied Physics
Tidey J
(2024)
Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze Sr2NaNb5O15
in Communications Materials
Valleti S
(2022)
Unsupervised learning of ferroic variants from atomically resolved STEM images
in AIP Advances
| Description | A sound understanding of the microstructure of this material has been developed using a combination of electron microscopy, electron diffraction, X-ray diffraction and theoretical modelling. The way functional properties change with temperature can now be linked to changes in the structure, i.e. distortions of the metal-oxide framework, which induce ferroelectricity. |
| Exploitation Route | This is the first in-depth study of this material and establishes a framework that can be used across the whole class of tetragonal tungsten bronzes. They stil look promising for high voltage/hgh temperature applications. |
| Sectors | Electronics Energy |
| Description | High Permittivity, Quasi Linear Dielectrics for High Field/Temperature Capacitors in Power Electronics |
| Amount | £1,191,831 (GBP) |
| Funding ID | APP28781 |
| Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
| Sector | Public |
| Country | United Kingdom |
| Start | 03/2025 |
| End | 03/2028 |
| Title | Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze Sr2NaNb5O15 - Data Upload |
| Description | PXRD data collected at Taiwan Photon Source (TPS) and Diamond Light Source (DLS) relating to the refinements discussed in the npj Communications Materials manuscript, Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze Sr2NaNb5O15.10 K and room-temperature neutron powder X-ray data from D2B of ILL and the according refinements discussed in the manuscript, Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze, Sr2NaNb5O15.DFT-relaxed structures and phonon plots discussed in manuscript, Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze, Sr2NaNb5O15. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2024 |
| Provided To Others? | Yes |
| URL | https://figshare.com/articles/dataset/_b_Structural_origins_of_dielectric_anomalies_in_the_filled_te... |
| Title | Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze, Sr2NaNb5O15 - Data Upload |
| Description | PXRD data collected at Taiwan Photon Source (TPS) and Diamond Light Source (DLS) relating to the refinements discussed in the manuscript, Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze, Sr2NaNb5O15.10 K and room-temperature neutron powder X-ray data from D2B of ILL and the according refinements discussed in the manuscript, Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze, Sr2NaNb5O15.DFT-relaxed structures and phonon plots discussed in manuscript, Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze, Sr2NaNb5O15. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2023 |
| Provided To Others? | Yes |
| URL | https://figshare.com/articles/dataset/_b_Structural_origins_of_dielectric_anomalies_in_the_filled_te... |
| Title | Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze, Sr2NaNb5O15 - Data Upload |
| Description | PXRD data collected at Taiwan Photon Source (TPS) and Diamond Light Source (DLS) relating to the refinements discussed in the manuscript, Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze, Sr2NaNb5O15.10 K and room-temperature neutron powder X-ray data from D2B of ILL and the according refinements discussed in the manuscript, Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze, Sr2NaNb5O15.DFT-relaxed structures and phonon plots discussed in manuscript, Structural origins of dielectric anomalies in the filled tetragonal tungsten bronze, Sr2NaNb5O15. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2023 |
| Provided To Others? | Yes |
| URL | https://figshare.com/articles/dataset/_b_Structural_origins_of_dielectric_anomalies_in_the_filled_te... |
| Description | Ian Reaney |
| Organisation | University of Sheffield |
| Country | United Kingdom |
| Sector | Academic/University |
| PI Contribution | Based on demonstrated expertise in electron microscopy of ferroelectric oxides - publications and presentations funded by this award - I was contacted by Prof. Ian Reaney to work on a joint UKRI proposal for quasi-linear dielectric materials based on NaNbO3. This has been funded (start date March 2025). Initial analysis of materials provided by Prof. Reaney has taken place and the data will contribute to a publication, to be submitted presently. |
| Collaborator Contribution | Development of materials and concepts for the new proposal. Provision of materials for analysis at Warwick. |
| Impact | APP28781: High Permittivity, Quasi Linear Dielectrics for High Field/Temperature Capacitors in Power Electronics Project lead: Ian Reaney |
| Start Year | 2024 |
| Description | Trondheim |
| Organisation | Norwegian University of Science and Technology (NTNU) |
| Country | Norway |
| Sector | Academic/University |
| PI Contribution | Electron microscopy of tetragonal tungsten bronzes provided by NTNU |
| Collaborator Contribution | Provision of materials and research questions by NTNU |
| Impact | Electron microscopy data has been obtained that will contribute to a publication |
| Start Year | 2024 |