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Article Dans Une Revue Journal of the European Ceramic Society Année : 2023

Microstructure and thermoelectric properties of Al-doped ZnO ceramic prepared by spark plasma sintering

Résumé

The high thermal and low electrical conductivities of ZnO ceramics have hindered their thermoelectric applications. The doping of ZnO with group 3 elements can enhance the thermoelectric properties. In this work, Al (2 at%) doped ZnO powder was sintered using spark plasma sintering at varying parameters (such as temperature (550-700 ℃), pressure (250-500 MPa) and the temperature of pressure application (Room Temperature (RT) and Holding Time (HT))). Maximum relative density of 98.9% was achieved at a temperature and pressure of 650 • C and 250 MPa, respectively. The Al-doped ZnO ceramics improved in electrical conductivity which caused a decrease in the Seebeck coefficient because of increased carrier concentration. The reduction in the grain size due to inhibiting growth effects of aluminum lead to a decrease in the thermal conductivity through phonon scattering at the grain boundaries. Hence, ZT of 0016 at 500 • C was obtained. This study indicated that Al-doped ZnO ceramics can be sintered at very low temperature of 650 • C. These conditions allow to retain the nanostructure, which is beneficial in improving the thermoelectric properties.
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Dates et versions

hal-03851406 , version 1 (14-11-2022)

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Precious Manti Radingoana, Sophie Guillemet-Fritsch, Jacques Noudem, Peter Apata Olubambi, Geoffroy Chevallier, et al.. Microstructure and thermoelectric properties of Al-doped ZnO ceramic prepared by spark plasma sintering. Journal of the European Ceramic Society, 2023, 43 (3), pp.1009--1016. ⟨10.1016/j.jeurceramsoc.2022.10.034⟩. ⟨hal-03851406⟩
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