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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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Le, Thanh Hung
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (11/11 displayed)
- 2019Contact of ZnSb thermoelectric material to metallic electrodes using S-Bond 400 solder alloycitations
- 2017Efficient p-n junction-based thermoelectric generator that can operate at extreme temperature conditionscitations
- 2017Microstructure and chemical data of the thermoelectric ZnSb material after joining to metallic electrodes and heat treatmentcitations
- 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
- 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
- 2012High-temperature segmented thermoelectric oxide module using p-type Ca3Co4O9 and n-type ZnAlO/CaMn0.95Nb0.05O3 legs
- 2012High-temperature segmented thermoelectric oxide module using p -type Ca 3 Co 4 O 9 and n -type ZnAlO/CaMn 0.95 Nb 0.05 O 3 legs
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article
The Influence of α- and γ-Al2O3 Phases on the Thermoelectric Properties of Al-doped ZnO
Abstract
A systematic investigation on the microstructure and thermoelectric properties of Al-doped ZnO using α- and γ-Al2O3 as dopants was conducted in order to understand the doping effect and its mechanism. The samples were prepared by the spark plasma sintering technique from precursors calcined at various temperatures. Clear differences in microstructure and thermoelectric properties were observed between the samples doped with α- and γ-Al2O3. At any given calcination temperature, γ-Al2O3 resulted in the formation of a larger amount of the ZnAl2O4 phase in the Al-doped ZnO samples. The average grain size was found to be smaller for the γ-Al2O3-doped samples than that for the α-Al2O3-doped ones under the same sintering condition. It is proposed that the ZnAl2O4 phase is the reason for the observed suppression of grain growth and also for the slightly reduced lattice thermal conductivity exhibited by these samples. The γ-Al2O3 promoted the substitution for donor impurities in ZnO, thus resulting in shrinkage of the unit cell volume and an increase in the electrical conductivity compared with the α-Al2O3-doped ZnO. At a calcination temperature of 1173K, the γ-Al2O3-doped sample showed a ZT value of 0.17 at 1173K, which is 27% higher than that of the α-Al2O3-doped sample.