| 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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Thuault, Anthony
Laboratoire de Mécanique et Procédés de Fabrication
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (25/25 displayed)
- 2023Microwave-assisted debinding of Al2O3 parts printed by stereolithographycitations
- 2022Fabrication of doped b-tricalcium phosphate bioceramics by robocasting for bone repair applications
- 2022Fabrication of doped b-tricalcium phosphate bioceramics by robocasting for bone repair applications
- 2021Effect of build orientation on the manufacturing process and the properties of stereolithographic dental ceramics for crown frameworkscitations
- 2021Fabrication of higher thermal stability doped β-tricalcium phosphate bioceramics by robocasting
- 2021Influence of dopants on thermal stability and densification of β-tricalcium phosphate powderscitations
- 2021Mechanical modelling of microwave sintering and experimental validation on an alumina powdercitations
- 2020Mechanical properties of thermally sprayed porous alumina coating by Vickers and Knoop indentationcitations
- 2020Mechanical properties of thermally sprayed porous alumina coating by Vickers and Knoop indentationcitations
- 2020Coupling additive manufacturing and microwave sintering: A fast processing route of alumina ceramicscitations
- 2020Fabrication of higher thermal stability doped β-tricalcium phosphate bioceramics by robocasting
- 2020Influence of microwave sintering on electrical properties of BCTZ lead free piezoelectric ceramicscitations
- 2020Experimental study and thermal mechanical modelling for alumina
- 2019Tribological behavior of composites fabricated by reactive SPS sintering in Ti‐Si‐C systemcitations
- 2018Unconventional Sintering of a Commercial Cemented WC-6Co Hardmetal
- 2017Comparison of conventional Knoop and Vickers hardness of ceramic materialscitations
- 2017Stereolithography ; Stereolithography: A new method for processing dental ceramics by additive computer-aided manufacturingcitations
- 2017Mechanical characterization of brittle materials using instrumented indentation with Knoop indentercitations
- 2015Damage Analysis of a Ferritic SiMo Ductile Cast Iron Submitted to Tension and Compression Loadings in Temperaturecitations
- 2015Comparison of Conventional and Microwave Sintering of Bioceramicscitations
- 2014Microwave sintering of large size pieces with complex shapecitations
- 2014Effects of microwave sintering on intrinsic defects concentrations in ZnO-based varistorscitations
- 2013Processing of reaction-bonded B4C-SiC composites in a single-mode microwave cavitycitations
- 2013Frittage micro-ondes en cavité monomode de biocéramiquescitations
- 2013Interrelation Between the Variety and the Mechanical Properties of Flax Fibrescitations
Places of action
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article
Effects of microwave sintering on intrinsic defects concentrations in ZnO-based varistors
Abstract
Nowadays the most important part of varistors is made from doped ZnO. The typical varistor microstructure consists in a large number of n–p–n junctions. ZnO grains are intrinsic n-type semiconductors because of the displacement of zinc atoms in interstitial positions and the formation of oxygen vacancies. The addition of some dopants (for instance bismuth and antimony oxides) allows creating a p-type semiconduction at the grain boundaries. In our study, ZnO-based varistor with standard composition was sintered by microwave and in a conventional furnace with the same sintering temperatures and dwell times. Electrical characterizations after direct microwave sintering showed that these samples presented a high electrical conductivity which avoids getting a good current–voltage non-linearity. This high conductivity could be due to higher concentrations in interstitial zinc and oxygen vacancies after the microwave process. It is assumed that microwaves cause a displacement of the equilibria of those reactions leading to a partial reduction of the samples. A post thermal treatment in a conventional furnace at 650 °C for 24 h under oxygen atmosphere was realized so as to reach the thermodynamic equilibrium. After this treatment the electrical conductivity drastically decreased supporting the idea that the defects concentrations have also decreased.