| 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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Gregg, Marty
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (43/43 displayed)
- 2024Observation of antiferroelectric domain walls in a uniaxial hyperferroelectriccitations
- 2023Ferroelectric domain wall p-n junctionscitations
- 2022Conducting ferroelectric domain walls emulating aspects of neurological behaviorcitations
- 2021Influence of charged walls and defects on DC resistivity and dielectric relaxations in Cu-Cl boracite
- 2021An empirical approach to measuring interface energies in mixed-phase bismuth ferritecitations
- 2020Lead palladium zirconate titanate: A room temperature nanoscale multiferroic thin filmcitations
- 2020Nanodomain Patterns in Ultra-Tetragonal Lead Titanate (PbTiO3)citations
- 2019Studies of Multiferroic Palladium Perovskitescitations
- 2017Non-equilibrium ferroelectric-ferroelastic 10nm nanodomains: wrinkles, period-doubling and power-law relaxationcitations
- 2017Mapping grain boundary heterogeneity at the nanoscale in a positive temperature coefficient of resistivity ceramiccitations
- 2017Superdomain dynamics in ferroelectric-ferroelastic films: Switching, jamming and relaxationcitations
- 2014Studies of the Room-Temperature Multiferroic Pb(Fe0.5Ta0.5)0.4(Zr0.53Ti0.47)0.6O3: Resonant Ultrasound Spectroscopy, Dielectric, and Magnetic Phenomenacitations
- 2013A Lead-Free and High-Energy Density Ceramic for Energy Storage Applicationscitations
- 2012Increasing recoverable energy storage in electroceramic capacitors using "dead-layer" engineeringcitations
- 2010Synthesis of epitaxial metal oxide nanocrystals via a phase separation approachcitations
- 2009Settling the ‘‘Dead Layer’’ Debate in Nanoscale Capacitorscitations
- 2009Effect of wall thickness on the ferroelastic domain size of BaTiO3citations
- 2009The Influence of Point Defects and Inhomogeneous Strain on the Functional Behaviour of Thin film Ferroelectricscitations
- 2009Origin of Ferroelastic domains in Free-Standing Single Crystal Ferroelectric Filmscitations
- 2008CH022
- 2007Toward Self-Assembled Ferroelectric Random Access Memories: Hard-Wired Switching Capacitor Arrays with Almost Tb/in.2 Densitiescitations
- 2007Nanoscale ferroelectrics machined from single crystalscitations
- 2006Perovskite lead zirconium titanate nanorings: Towards nanoscale ferroelectriccitations
- 2006Scaling of domain periodicity with thickness measured in BaTiO3 single crystal lamellae and comparison with other ferroicscitations
- 2004Understanding thickness effects in thin film capacitorscitations
- 2004The effect of flexoelectricity on the dielectric properties of inhomogeneously strained ferroelectric thin filmscitations
- 2004Thickness independence of true phase transition temperatures in barium strontium titanate filmscitations
- 2004Intrinsic dielectric response in ferroelectric nano-capacitorscitations
- 2004Progressive loss of ferroelectricity under bipolar pulsed fields and experimental determination of non-switchable polarization in Au/Ba0.5Sr0.5TiO3/SrRuO3 thin-film capacitors
- 2004Thin film capacitor cut from single crystals using focused ion beam millingcitations
- 2004Effects of poling, and implications for metastable phase behavior in barium strontium titanate thin film capacitorscitations
- 2004Characteristics of the interfacial capacitance in thin film Ba0.5Sr0.5TiO3 capacitors with SrRuO3 and (La, Sr)CoO3 bottom electrodescitations
- 2004Maximum of dielectric permittivity caused by structural transition in ferroelectric BaTiO3-SrTiO3 superlattices
- 2003Evidence for two-phase regions in BST thin films from capacitance-voltage datacitations
- 2003Studies of switching kinetics in ferroelectric thin filmscitations
- 2003Dielectric and electromechanical properties of Pb(Mg-1/3,Nb- 2/3)O-3-PbTiO3 thin films grown by pulsed laser depositioncitations
- 2002Electrode field penetration: A new interpretation of tunneling currents in barium strontium titanate (BST) thin films
- 2002Exploring grain size as a cause for dead-layer effects in thin film capacitorscitations
- 2002Thickness-induced stabilization of ferroelectricity in SrRuO3/Ba0.5Sr0.5TiO3/Au thin film capacitorscitations
- 2002Switching dynamics in ferroelectric thin films: An experimental survey
- 2002Electromechanical properties of Pb(Mg1/3Nb2/3)O-3-7%PbTiO3 thin films made by pulsed laser depositioncitations
- 2001Investigation of dead-layer thickness in SrRuO3/Ba0.5Sr0.5TiO3/Au thin-film capacitorscitations
- 2001Enhancement of dielectric constant and associated coupling of polarization behavior in thin film relaxor superlatticescitations
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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.