Abstract
Compact polycrystalline samples of SrZn2Sb2 [space group \( P\overline{3} m1 \), a = 4.503(1) Å, c = 7.721(1) Å] were prepared by spark plasma sintering. Thermoelectric performance, Hall effect, and magnetic properties were investigated in the temperature range from 2 K to 650 K. The thermoelectric figure of merit ZT was found to increase with temperature up to ZT = 0.15 at 650 K. At this temperature the material showed a high Seebeck coefficient of +230 μV K−1, low thermal conductivity of 1.3 W m−1 K−1, but rather low electrical conductivity of 54 S cm−1, together with a complex temperature behavior. SrZn2Sb2 is a diamagnetic p-type conductor with a carrier concentration of 5 × 1018 cm−3 at 300 K. The electronic structure was calculated within the density-functional theory (DFT), revealing a low density of states (DOS) of 0.43 states eV−1 cell−1 at the Fermi level.
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Acknowledgements
Financial support by the National Basic Research Program of China under Project (2007CB607503) and the MPG-CAS Partner Group Program is gratefully acknowledged. We thank the Kompetenzgruppen Metallografie, Struktur and Chemische Analyse at MPI-CPfS.
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Open Access This is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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Zhang, H., Tang, MB., Schnelle, W. et al. Thermoelectric Properties of Polycrystalline SrZn2Sb2 Prepared by Spark Plasma Sintering. J. Electron. Mater. 39, 1772–1776 (2010). https://doi.org/10.1007/s11664-010-1151-2
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DOI: https://doi.org/10.1007/s11664-010-1151-2