| 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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Wasiucionek, Marek
Warsaw University of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (26/26 displayed)
- 2021Towards Higher Electric Conductivity and Wider Phase Stability Range via Nanostructured Glass-Ceramics Processingcitations
- 2019Properties of LiMnBO3 glasses and nanostructured glass-ceramicscitations
- 2016Dependence of a glass transition temperature on a heating rate in DTA experiments for glasses containing transition metal oxidescitations
- 2016Synthesis of nanostructured Li3Me2(PO4)2F3 glass-ceramics (Me = V, Fe, Ti)citations
- 2016Nanocrystallisation in vanadate phosphate and lithium iron vanadate phosphate glassescitations
- 2015High electronic conductivity in nanostructured materials based on lithium-iron-vanadate-phosphate glassescitations
- 2013Isothermal nanocrystallization of vanadate-phosphate glassescitations
- 2013Novel vanadium-doped olivine-like nanomaterials with high electronic conductivitycitations
- 2011DSC and electrical conductivity studies on superionic all-glass phosphate-based composites
- 2011Electrical properties of the all-glass composite silver ion conductorscitations
- 2011Electrical properties and thermal stability of FePO4 glasses and nanomaterialscitations
- 2011Electrical properties vs. microstructure of nanocrystallized V2O5–P2O5 glasses — An extended temperature range studycitations
- 2011Electrical conductivity and phase transformations in the composite ionic conductors AgI : α-Al2O3 prepared via a high-pressure routecitations
- 2009Novel nanomaterials based on electronic and mixed conductive glassescitations
- 2009The thermal stability, local structure and electrical properties of lithium-iron phosphate glasses
- 2009Correlation between electrical properties and microstructure of nanocrystallized V2O5–P2O5 glassescitations
- 2008Electrical properties and microstructure of glassy-crystalline Ag+-ion conducting composites synthesized by a high-pressure methodcitations
- 2007Nanocrystallization as a method of improvement of electrical properties and thermal stability of V2O5-rich glassescitations
- 2007Conductivity, thermal behavior and microstructure of new composites based on AgI–Ag2O–B2O3 glasses with Al2O3 matrixcitations
- 2006Conductivity and microstructure of silver borate glass/zirconia composites, prepared via a high pressure route
- 2006Effect of nanocrystallization on the electronic conductivity of vanadate-phosphate glassescitations
- 2006Crystallization processes in superionic AgI-Ag20-P205 ([Ag2O]/[P2O5] = 3) glasses
- 2005A XANES study of the valence state of vanadium in lithium vanadate phosphate glassescitations
- 2004Enhancement of electrical conductivity in lithium vanadate glasses by nanocrystallizationcitations
- 2003Cyclic voltammetry and impedance spectroscopy studies of silver vanadate phosphate glassescitations
- 2001Ionic conductivity of glass-ceramic composites in the AgI-Ag<inf>2</inf>O-V<inf>2</inf>O<inf>5</inf> system
Places of action
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article
High electronic conductivity in nanostructured materials based on lithium-iron-vanadate-phosphate glasses
Abstract
Highly conducting olivine-like materials have been prepared by thermal nanocrystallization of a series of glassy lithium-iron-vanadate-phosphates, of the compositions close to that of the LiFePO4 olivine, with only small amounts of vanadium additive. It was found out that their thermal treatment up to a certain temperature, from the 460 and 500 °C range, optimized for each composition separately, led to: i) a considerable and irreversible conductivity increase by a factor of up to 106 (at room temperature) and ii) a change in the microstructure, from purely amorphous to nanocrystalline (for samples with lower vanadium contents) or polycrystalline (for a sample with higher vanadium content). The conductivity enhancement was accompanied by a decrease in the activation energy from the initial value of ca 0.70 eV to ca 0.11 eV after nanocrystallization. STEM and HRTEM microscopy studies showed, that in the materials with lower vanadium content, the heat treatment leads to formation of very small (ca 10 nm) crystallites densely distributed inside the glassy matrices. For the material with higher vanadium content similar processing leads to crystallization with larger grains (over 100 nm). The increase in conductivity of the latter material was smaller, than in the former ones. The observed correlation between the improvement of the electrical properties and a microstructure of annealed samples was attributed to a substantial role of the interfacial regions in the electrical conduction. These defective interfacial regions contain an increased concentration of transition metal aliovalent ions, which can provide multiple channels for electronic hopping between: Fe2+ and Fe3+, V4+ and V5+, or V3+ and V4+ centers. As the volume fraction of the interfacial regions in the nanostructured (with 10 nm grains) material is much higher than in a coarse-grained one (over 100 nm), the effective conductivity of the former material is much higher than that of the latter one.1 © 2015 Elsevier B.V. All rights reserved.