期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 39, 期 4, 页码 1222-1229出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2018.11.029
关键词
Zinc oxide; Thermoelectric performance; Electrical properties; Thermal conductivity; Zirconium doping
资金
- FCT [IF/00302/2012, UID/CTM/50011/2013]
- FCT
- DAAD (Germany)
- COMPETE 2020 Program [POCI-01-0145-FEDER-031875]
- operational Program POCI in its FEDER/FNR component
- Foundation for Science and Technology, in its State Budget component (OE)
- FEDER under the PT2020 Partnership Agreement
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 similar to 2.3 times increase in ZT as compared to single-doped materials, reaching similar to 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.
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