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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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Han, Li
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2020Interface fracture energy of contact layers in a solid oxide cell stackcitations
- 2018High-temperature thermoelectric properties of Na- and W-Doped Ca3Co4O9 system citations
- 2017Mid-IR optical properties of silicon doped InPcitations
- 2017Thermal operating window for PEDOT:PSS films and its related thermoelectric propertiescitations
- 2017Thermal operating window for PEDOT:PSS films and its related thermoelectric propertiescitations
- 2016On the Challenges of Reducing Contact Resistances in Thermoelectric Generators Based on Half-Heusler Alloyscitations
- 2016On the Challenges of Reducing Contact Resistances in Thermoelectric Generators Based on Half-Heusler Alloyscitations
- 2016On the Challenges of Reducing Contact Resistances in Thermoelectric Generators Based on Half-Heusler Alloyscitations
- 2016Effects of spark plasma sintering conditions on the anisotropic thermoelectric properties of bismuth antimony telluridecitations
- 2016Scandium-doped zinc cadmium oxide as a new stable n-type oxide thermoelectric materialcitations
- 2016Promising bulk nanostructured Cu2Se thermoelectrics via high throughput and rapid chemical synthesiscitations
- 2014Characterization of the interface between an Fe–Cr alloy and the p-type thermoelectric oxide Ca3Co4O9citations
- 2014The effect of setting velocity on the static and fatigue strengths of self-piercing riveted joints for automotive applications
- 2014Fabrication, spark plasma consolidation, and thermoelectric evaluation of nanostructured CoSb3citations
- 2014Characterization of the interface between an Fe–Cr alloy and the p -type thermoelectric oxide Ca 3 Co 4 O 9citations
- 2014Fabrication, spark plasma consolidation, and thermoelectric evaluation of nanostructured CoSb 3citations
- 2013The Influence of α- and γ-Al 2 O 3 Phases on the Thermoelectric Properties of Al-doped ZnOcitations
- 2013The Influence of α- and γ-Al2O3 Phases on the Thermoelectric Properties of Al-doped ZnOcitations
- 2008Formation and microstructure of (Ti, V)C-reinforeed iron-matrix composites using self-propagating high-temperature synthesis
- 2006Fretting behaviour of self-piercing riveted aluminium alloy joints under different interfacial conditions
Places of action
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article
High-temperature thermoelectric properties of Na- and W-Doped Ca3Co4O9 system
Abstract
The detailed crystal structures and high temperature thermoelectric properties of polycrystalline Ca<sub>3−2<em>x</em></sub>Na<sub>2<em>x</em></sub>Co<sub>4−<em>x</em></sub>W<sub><em>x</em></sub>O<sub>9</sub> (0 ≤ <em>x</em>≤ 0.075) samples have been investigated. Powder X-ray diffraction datashow that all samples are phase pure, with no detectable traces ofimpurity. The diffraction peaks shift to lower angle values withincrease in doping (<em>x</em>), which is consistent with larger ionic radii of Na<sup>+</sup> and W<sup>6+</sup> ions. X-ray photoelectron spectroscopy data reveal that a mixture of Co<sup>2+</sup>, Co<sup>3+</sup> and Co<sup>4+</sup> valence states are present in all samples. It has been observed that electrical resistivity (<em>ρ</em>), Seebeck coefficient (<em>S</em>) and thermal conductivity (<em>κ</em>) are all improved with dual doping of Na and W in Ca<sub>3</sub>Co<sub>4</sub>O<sub>9</sub> system. A maximum power factor (PF) of 2.71 × 10<sup>−4</sup> W m<sup>−1</sup> K<sup>−2</sup> has been obtained for <em>x</em> = 0.025 sample at 1000 K. The corresponding thermoelectric figure of merit (<em>zT</em>) for <em>x</em> = 0.025 sample is calculated to be 0.21 at 1000 K, which is ∼2.3 times higher than <em>zT</em>value of the undoped sample. These results suggest that Na and W dualdoping is a promising approach for improving thermoelectric propertiesof Ca<sub>3</sub>Co<sub>4</sub>O<sub>9</sub> system.