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Thermophysical Properties of Semiconductors

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Metallurgy in Space

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

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Abstract

The thermophysical properties of melts of samples from the Si-Ge system were measured in the Electromagnetic Levitator on board of the International Space Station (ISS-EML). The containerless measurements of the density, thermal expansion, surface tension, viscosity, and electrical resistivity were performed with highly doped samples in the stable melt as well as in the undercooled state.

The volume and the electrical resistivity show a nonlinear temperature dependence. This behavior can be interpreted in terms of a structural change (phase transition) in the melt. With decreasing temperature, covalent, tetrahedral structure elements (small range order) begin to form, and therefore, the specific volume deviates from that of a simple liquid, which is characterized by a simple two-body interatomic potential with linear thermal expansion, leading to the observed nonlinear temperature dependence.

The surface tension was investigated with the oscillating drop technique. The data are comparable to previous measurements and are only slightly temperature dependent. The surface oscillations are exponentially damped. The damping is dominated by turbulent flow in the melt.

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Acknowledgments

The authors acknowledge the access to the ISS-EML, which is a joint undertaking of the European Space Agency (ESA) and the DLR Space Administration. The reported work was conducted in the framework of the ESA research project SEMITHERM (AO-2000-068). The authors acknowledge also the colleagues from DLR/MUSC in Cologne for the help with the realization of the experiments and N. Abrosimov et al. in Leibniz Institute for Crystal Growth in Berlin for sample material preparations. The work is financially supported by DLR Bonn via project 50WM1750.

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Authors and Affiliations

  1. I. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany

    Yuansu Luo, Bernd Damaschke & Konrad Samwer

  2. Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), Köln, Germany

    Georg Lohöfer

Authors
  1. Yuansu Luo
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  2. Bernd Damaschke
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  3. Georg Lohöfer
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  4. Konrad Samwer
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Corresponding author

Correspondence to Bernd Damaschke .

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Editors and Affiliations

  1. Institute of Functional Nanosystems, Ulm University, Ulm, Germany

    Hans-Jörg Fecht

  2. Institute of Functional Nanosystems, Ulm University, Ulm, Germany

    Markus Mohr

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Luo, Y., Damaschke, B., Lohöfer, G., Samwer, K. (2022). Thermophysical Properties of Semiconductors. In: Fecht, HJ., Mohr, M. (eds) Metallurgy in Space . The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-89784-0_18

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