New direction in high temperature dielectrics: unlocking performance of doped tungsten bronze oxides through mechanistic understanding
Lead Research Organisation:
UNIVERSITY OF MANCHESTER
Department Name: Materials
Abstract
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Organisations
Publications
Cao X
(2025)
Enhanced mechanical properties and atomic-scale mechanisms of ferroelastic domain switching for GdNbO4-La2Zr2O7 materials
in Scripta Materialia
Gao Y
(2025)
Enhancing mechanical properties and densification of aerosol-deposited coatings by introducing YSZ into Al2O3
in Journal of the European Ceramic Society
Haronin V
(2024)
Broadband dielectric spectroscopy of Nb-doped 0.7BiFeO 3 -0.3BaTiO 3 ceramics
in Journal of Physics Communications
Narayan B
(2024)
Temperature-Dependent Ferroelectric Properties and Aging Behavior of Freeze-Cast Bismuth Ferrite-Barium Titanate Ceramics.
in ACS applied materials & interfaces
Pan J
(2024)
Effects of quenching and annealing on conductivity and ferroelectric properties of Na0.5Bi0.5TiO3-NaNbO3 ceramics
in Journal of the European Ceramic Society
Pan J
(2024)
Effects of quenching on domain switching and electric field-induced phase transformations in Na0.5Bi0.5TiO3-NaNbO3 ceramics
in Journal of the European Ceramic Society
Peirson H
(2023)
Structure and dielectric properties of yttrium-doped Ca0.28Ba0.72Nb2O6 ceramics
in Journal of Alloys and Compounds
Wheeler J
(2025)
Olivine Deformation: To B Slip or Not to B Slip, That Is the Question
in Geophysical Research Letters
| Description | New ceramic materials based on strontium sodium niobate and calcium barium niobate have been developed with regard to their use in electrical capacitors. The main investigations were focused on 'bulk' ceramics, suitable for applications in multilayer ceramic capacitors; further work was also undertaken to evaluate the properties of the materials in the form of 'thin films' produced by particulate aerosol deposition. Suitable chemical compositions have been identified with consideration of cost, lack of toxic ingredients and compatibility with modern manufacturing processes. To complement the thorough structural characterisation studies of our partner organisations (Universities of Leeds, Warwick and Sheffield), extensive electrical characterisation was carried out in Manchester to identify specific materials having excellent stability of electrical properties at high temperatures and under high electrical loading conditions. It was demonstrated that these materials can surpass the performance of conventional barium titanate ceramics for use in high temperature environments, which are becoming increasing significant in automotive, aerospace and down-hole drilling applications, as well as high power electronics. In addition to the planned research on sustainable ceramic dielectrics for high temperature environments, the enhanced electrical characterisation methods that we developed were applied to the evaluation of new lead-free perovskite ferroelectrics, based on bismuth ferrite-barium titanate solid solutions, for applications in high temperature/high power piezoelectric devices. It was shown that these materials, prepared through several PhD projects, exhibit exceptional stability under extreme conditions and are well suited for diverse applications in electromechanical sensors, actuators and transducers. |
| Exploitation Route | The chemical compositions and processing methods developed during the project may be explored by other researchers and further modified for the manufacture of capacitors and dielectric energy storage devices. The advanced electrical characterisation methods that have been applied for evaluation of the candidate dielectrics under 'real world' conditions can be applied by other researchers in academia and industry. |
| Sectors | Aerospace Defence and Marine Electronics Energy Manufacturing including Industrial Biotechology |
| Description | UKRI Impact Acceleration Account Commercial Development Grant Scheme, IAA IS8: Scale-Up and High-Temperature Characterization of BFH Piezoelectric Ceramics |
| Amount | £54,476 (GBP) |
| Funding ID | IAA IS8 |
| Organisation | University of Manchester |
| Sector | Academic/University |
| Country | United Kingdom |
| Start | 01/2026 |
| End | 04/2026 |