Abstract
oncerning a materials ability to convert heat to electrical energy, the electrical power factor S2/ρ as well as the thermal conductivity at elevated temperatures are of special interest. Since Flash experiments measure the thermal diffusivity and standard steady-state heat-flow experiments are inaccurate at elevated temperatures due to radiation errors inherent to this technique, direct and accurate thermal conductivity data on type-I clathrate single crystals at elevated temperatures are scarce in literature. Here we report 3ω thermal conductivity data on single crystalline Ba8Cu5.09Ge40.91 (BCG), La1.23Ba6.99Au5.91Si39.87, and Ce1.06Ba6.91Au5.56Si40.47 in the temperature range between 80 and 330 K, and specific heat data on BCG between 2 and 300 K. The comparison of our room temperature phonon thermal conductivity data (κph) to results on transition metal (TM) free type-I clathrates in terms of the guest free space (Rfree) suggests a stronger dependence of κph on Rfree for the clathrates containing TM elements.
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Acknowledgments
The authors thank J. Schalko for preparing insulating Si02 layers. The 3co heater structures were fabricated at the cleanroom facilities (ZMNS, Center for Micro- and Nanostrucmres) at the Vienna University of Technology. We acknowledge financial support from the Austrian Science Fund (FWF project TRP 176-N22 and doctoral program W1243 Solids4Fun) and from the German Research Foundation (DFG SPP 1386 - project nanOcla).
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Ikeda, M., Yan, X., Prochaska, L. et al. Thermal conductivity of transition metal containing type-I clathrates. MRS Online Proceedings Library 1735, 82–90 (2014). https://doi.org/10.1557/opl.2015.269
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DOI: https://doi.org/10.1557/opl.2015.269