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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Owen, John R.
University of Southampton
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (3/3 displayed)
- 2018Combination of solid state and electrochemical impedance spectroscopy to explore effects of porosity in sol-gel derived BaTiO3 thin filmscitations
- 2016In situ phase behaviour of a high capacity LiCoPO4 electrode during constant or pulsed charge of a lithium cellcitations
- 2013Templated non-oxide sol-gel preparation of well-ordered macroporous (inverse opal) Ta3N5 filmscitations
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article
Combination of solid state and electrochemical impedance spectroscopy to explore effects of porosity in sol-gel derived BaTiO3 thin films
Abstract
BaTiO3 thin films were deposited onto polycrystalline Pt using a dip-coating technique, with annealing temperatures of 750 to 900 °C. To avoid film imperfections such as cracking or regions of zero BaTiO3 coverage (pinholes), key conditions, including aging periods, water content, and spin velocities, were refined to produce a pinhole free, uniform films with some porosity. Whilst those coated a single time short circuited during electrical characterization, this could be avoided in films produced by multiple coating cycles. The relative permittivity of a 600 nm BaTiO3 film was measured at 290 by fitting solid state impedance data in the frequency range 100 Hz to 1 MHz. Electrochemical impedance with an aqueous electrolyte allowed evaluation of the porosity, which remained fairly constant between one and five coating cycles. Using this method it was possible to estimate the relative permittivity of the BaTiO3 itself as 374 and hence to evaluate the increase in the relative permittivity that could be achievable by minimizing porosity.