Abstract
Thermoelectric transport properties at temperatures below 300 K were determined for clathrate-I phases K8Li x Ge44−x/4□2−3x/4 (□ denotes a vacancy) with compositions 0.25 ≤ x ≤ 2.7. Samples were prepared by solid-state reaction and compacted by spark plasma sintering. The lattice constants and chemical composition of the samples were investigated by x-ray powder diffraction and wavelength dispersive x-ray spectroscopy, respectively. Depending on composition, the temperature dependence of the electrical resistivity is metal or semiconductor-like. Absolute value of the negative Seebeck coefficient (n-type conductivity) increased linearly with temperature. All samples had low thermal conductivity of 1–1.5 W m−1 K−1 at 300 K.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (No. 51301071), the Science and Technology Commission of Shanghai Municipality (No. 13PJ1401800) and the Innovation Program of Shanghai Municipal Education Commission (No. 14ZZ057). The authors acknowledge the support of Dr. U. Burkhardt during metallographic characterization.
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Liang, Y., Schnelle, W., Veremchuk, I. et al. Synthesis and Thermoelectric Properties of the Clathrate-I Phase K8Li x Ge44−x/4□2−3x/4 . J. Electron. Mater. 44, 4444–4451 (2015). https://doi.org/10.1007/s11664-015-3960-9
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DOI: https://doi.org/10.1007/s11664-015-3960-9