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Title: Synergistic effects of zirconium- and aluminum co-doping on the thermoelectric performance of zinc oxide
Author: Zakharchuk, Kiryl V.
Tobaldi, David M.
Xiao, Xingxing
Xie, Wenjie
Mikhalev, Sergey M.
Martins, João F.
Frade, Jorge R.
Weidenkaff, Anke
Kovalevsky, Andrei V.
Keywords: Electrical properties
Thermal conductivity
Thermoelectric performance
Zinc oxide
Zirconium doping
Issue Date: Apr-2019
Publisher: Elsevier
Abstract: This work aims to explore zirconium as a possible dopant to promote thermoelectric performance in bulk ZnO-based materials, both within the single-doping concept and on simultaneous co-doping with aluminum. At 1100–1223 K mixed-doped samples demonstrated around ∼2.3 times increase in ZT as compared to single-doped materials, reaching ∼0.12. The simultaneous presence of aluminum and zirconium imposes a synergistic effect on electrical properties provided by their mutual effects on the solubility in ZnO crystal lattice, while also allowing a moderate decrease of the thermal conductivity due to phonon scattering effects. At 1173 K the power factor of mixed-doped Zn0.994Al0.003Zr0.003O was 2.2–2.5 times higher than for single-doped materials. Stability tests of the prepared materials under prospective operation conditions indicated that the gradual increase in both resistivity and Seebeck coefficient in mixed-doped compositions with time may partially compensate each other to maintain a relatively high power factor
Peer review: yes
DOI: 10.1016/j.jeurceramsoc.2018.11.029
ISSN: 0955-2219
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Appears in Collections:CICECO - Artigos

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