Sn-Al co-doped polycrystalline ZnO ceramics were prepared by sintering in air. Phase and microstructure analysis was performed by X-ray diffraction and SEM-EDS and thermoelectric properties were measured. XRD analysis showed a ZnO primary phase as well as secondary phase peaks due to the formation of a Zn2SnO4 spinel phase or SnO2(ZnO:Sn-Al)m intergrowth phase. SEM analysis revealed a dense microstructure with a small number of nanometric pores, consistent with the measured density of 5.48 g/cm3. An activated electrical conductivity characteristic of a semiconducting material was observed as well as a negative Seebeck coefficient with both values increasing in absolute value from RT to 730 °C. The power factor had a maximum value of 3.73×10−4 W m−1 K−2 at 730 °C. Thermal conductivity measurements showed a significant reduction over the measured temperature range compared to undoped ZnO. This could be attributed to grain size reduction, the formation of a nanoscale secondary phase or a reduction in crystallinity caused by Sn-Al co-doping. A maximum ZT of 0.06 was obtained at 750 °C for the Sn-Al co-doped ZnO ceramics.
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26 August 2016
FRONTIERS IN MATERIALS SCIENCE (FMS2015): Proceedings of the 2nd International Symposium on Frontiers in Materials Science
19–21 November 2015
Tokyo, Japan
Research Article|
August 26 2016
Microstructural analysis and thermoelectric properties of Sn-Al co-doped ZnO ceramics
Joshua Hoemke;
Joshua Hoemke
a)
1Institute of Engineering Innovation,
The University of Tokyo
, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
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Atta Ullah Khan;
Atta Ullah Khan
2
National Institute of Materials Science (NIMS)
1-1 Namiki, Tsukuba 305-0044, Japan
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Hidehiro Yoshida;
Hidehiro Yoshida
3
National Institute of Materials Science (NIMS)
, 1–2–1 Sengen, Tsukuba, 305–0047, Japan
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Takao Mori;
Takao Mori
2
National Institute of Materials Science (NIMS)
1-1 Namiki, Tsukuba 305-0044, Japan
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Eita Tochigi;
Eita Tochigi
1Institute of Engineering Innovation,
The University of Tokyo
, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
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Naoya Shibata;
Naoya Shibata
1Institute of Engineering Innovation,
The University of Tokyo
, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
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Yuichi Ikuhara;
Yuichi Ikuhara
1Institute of Engineering Innovation,
The University of Tokyo
, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-8656, Japan
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Yoshio Sakka
Yoshio Sakka
3
National Institute of Materials Science (NIMS)
, 1–2–1 Sengen, Tsukuba, 305–0047, Japan
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a)
Corresponding author: jhoemke@sigma.t.u-tokyo.ac.jp
AIP Conf. Proc. 1763, 050004 (2016)
Citation
Joshua Hoemke, Atta Ullah Khan, Hidehiro Yoshida, Takao Mori, Eita Tochigi, Naoya Shibata, Yuichi Ikuhara, Yoshio Sakka; Microstructural analysis and thermoelectric properties of Sn-Al co-doped ZnO ceramics. AIP Conf. Proc. 26 August 2016; 1763 (1): 050004. https://doi.org/10.1063/1.4961357
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