| People | Locations | Statistics |
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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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Prestat, Eric
Culham Centre for Fusion Energy
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (22/22 displayed)
- 2020Splenic Capture and In Vivo Intracellular Biodegradation of Biological-grade Graphene Oxide Sheetscitations
- 2019Enhanced Intraliposomal Metallic Nanoparticle Payload Capacity Using Microfluidic-Assisted Self-Assemblycitations
- 2018Study on the formation of thin film nanocomposite (TFN) membranes of polymers of intrinsic microporosity and graphene-like fillers: effect of lateral flake size and chemical functionalizationcitations
- 2018Study on the formation of thin film nanocomposite (TFN) membranes of polymers of intrinsic microporosity and graphene-like fillers: effect of lateral flake size and chemical functionalizationcitations
- 2017A Simple Electrochemical Route to Metallic Phase Trilayer MoS2: evaluation as Electrocatalysts and Supercapacitorscitations
- 2017A Simple Electrochemical Route to Metallic Phase Trilayer MoS2: evaluation as Electrocatalysts and Supercapacitorscitations
- 2017Enhanced organophilic separations with mixed matrix membranes of polymers of intrinsic microporosity and graphene-like fillerscitations
- 2017Role of 2D and 3D defects on the reduction of LaNiO 3 nanoparticles for catalysiscitations
- 2017In Situ Industrial Bimetallic Catalyst Characterisation using Scanning Transmission Electron Microscopy and X-Ray Absorption Spectroscopy at One Atmosphere and Elevated Temperaturecitations
- 2017In Situ Industrial Bimetallic Catalyst Characterisation using Scanning Transmission Electron Microscopy and X-Ray Absorption Spectroscopy at One Atmosphere and Elevated Temperaturecitations
- 2017Observing imperfection in atomic interfaces for van der Waals heterostructurescitations
- 2017EXPLORING NANOSCALE PRECURSOR REACTIONS IN ALLOY 600 IN H2/N2-H2O VAPOR USING IN SITU ANALYTICAL TRANSMISSION ELECTRON MICROSCOPYcitations
- 2017Mapping grain boundary heterogeneity at the nanoscale in a positive temperature coefficient of resistivity ceramiccitations
- 2017Mapping grain boundary heterogeneity at the nanoscale in a positive temperature coefficient of resistivity ceramiccitations
- 2017Mapping grain boundary heterogeneity at the nanoscale in a positive temperature coefficient of resistivity ceramiccitations
- 2017EXPLORING NANOSCALE PRECURSOR REACTIONS IN ALLOY 600 IN H 2 /N 2 -H 2 O VAPOR USING IN SITU ANALYTICAL TRANSMISSION ELECTRON MICROSCOPYcitations
- 2017Role of 2D and 3D defects on the reduction of LaNiO3 nanoparticles for catalysiscitations
- 2016The Application of In Situ Analytical Transmission Electron Microscopy to the Study of Preferential Intergranular Oxidation in Alloy 600citations
- 2016The Application of In Situ Analytical Transmission Electron Microscopy to the Study of Preferential Intergranular Oxidation in Alloy 600citations
- 2016Imaging the hydrated microbe-metal interface using nanoscale spectrum imagingcitations
- 2016Synthesis and characterization of composite membranes made of graphene and polymers of intrinsic microporositycitations
- 2014Real-time imaging and elemental mapping of AgAu nanoparticle transformationscitations
Places of action
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article
Mapping grain boundary heterogeneity at the nanoscale in a positive temperature coefficient of resistivity ceramic
Abstract
Despite being of wide commercial use in devices, the orders of magnitude increase in resistance that can be seen in some semiconducting BaTiO3-based ceramics, on heating through the Curie temperature (TC), is far from well understood. Current understanding of the behavior hinges on the role of grain boundary resistance that can be modified by polarization discontinuities which develop in the ferroelectric state. However, direct nanoscale resistance mapping to verify this model has rarely been attempted, and the potential approach to engineer polarization states at the grain boundaries, that could lead to optimized positive temperature coefficient (PTC) behavior, is strongly underdeveloped. Here we present direct visualization and nanoscale mapping in a commercially optimized BaTiO3 –PbTiO3 –CaTiO3 PTC ceramic using Kelvin probe force microscopy, which shows that, even in the low resistance ferroelectric state, the potential drop at grain boundaries is significantly greater than in grain interiors. Aberration-corrected scanning transmission electron microscopy and electron energy loss spectroscopy reveal new evidence of Pb-rich grain boundaries symptomatic of a higher net polarization normal to the grain boundaries compared to the purer grain interiors. These results validate the critical link between optimized PTC performance and higher local polarization at grain boundaries in this specific ceramic system and suggest a novel route towards engineering devices where an interface layer of higher spontaneous polarization could lead to enhanced PTC functionality.