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DTSTAMP:20260422T184410Z
DTSTART;TZID=Europe/London:20230419T140000
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SUMMARY:School of Chemistry Colloquium: Professor Derek Sinclair (University of Sheffield)
DESCRIPTION:School of Chemistry Colloquium for final year project students, MSc students PhD students, post-doctoral researchers and academic staff.       There are over 3 Trillion Multi-Layer Ceramic Capacitors (MLCCs) produced annually for a variety of applications, eg mobile phones. These are based on the ferroelectric perovskite BaTiO3 and are engineered to have core-shell microstructures via chemical doping to impart the desired electrical properties.  Despite the success of BaTiO3, the demands for MLCCs to operate under more demanding conditions (e.g higher temperature (> 150 oC) and voltage (> 50 V)) and/or with substantially enhanced discharge energy density (> 10 J/cm3) has shifted the search onto other polar perovskites such as NaNbO3 and/or solid solutions between these materials.  Here we will: (i) use a resource efficient method to explore the solid solution between NaNbO3-BaTiO3 to develop the concept of a temperature stable bi-layer MLCC; (ii)  establish the influence of aliovalent dopants (A-site donors and B-site donors and acceptors) on the electrical properties of NaNbO3 to obtain an improved understanding of its basic defect chemistry; and (iii) develop a range of nominally stoichiometric solid solutions based on NaNbO3-SrTiO3­-La(Mg1/2Ti1/2)O3 that traverse from conventional to relaxor ferroelectric to incipient ferroelectric/quasi-linear dielectrics, the latter of which exhibit high discharge energy densities, > 40 J/cm3. https://events.st-andrews.ac.uk/events/school-of-chemistry-colloquium-prof-derek-sinclair-university-of-sheffield/
LOCATION:Purdie Building
URL:https://events.st-andrews.ac.uk/events/school-of-chemistry-colloquium-prof-derek-sinclair-university-of-sheffield/
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