Luo, Yuansu and Damaschke, Bernd and Schneider, Stephan and Lohöfer, Georg and Abrosimov, Nikolay and Czupalla, Matthias and Samwer, Konrad (2016) Contactless processing of SiGe-melts in EML under reduced gravity. npj Microgravity, 2, pp. 1-9. Nature Publishing Group. doi: 10.1038/s41526-016-0007-3. ISSN 2373-8065.
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Official URL: http://www.nature.com/articles/s41526-016-0007-3
Abstract
The processing of semiconductors based on lectromagnetic levitation is a challenge, because this kind of materials shows a poor electrical conductivity. Here, we report the results of measurements of the thermophysical properties obtained recently from highly doped semiconductors Si1−xGex under microgravity conditions in the framework of parabola flight campaigns. due to the limited time of about 20 s of microgravity especially Ge-rich samples with low melting temperatures were investigated. The measurements were performed contactlessly by video techniques with subsequent digital image processing. Linear and volume thermal Expansion coefficients were measured hereby from image data. An anomaly of volume changes near the solidus temperature is visible. Viscosity and surface tension were determined by the oscillating drop technique using optic and electronic data. It was observed that the alloying of Si into Ge increases the surface tension of the melts. The viscosity is following an Arrhenius equation and Shows a crossover temperature which separates simple liquid at high temperatures from cooperative liquid at low temperatures.
Item URL in elib: | https://elib.dlr.de/109777/ | ||||||||||||||||||||||||||||||||
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Document Type: | Article | ||||||||||||||||||||||||||||||||
Title: | Contactless processing of SiGe-melts in EML under reduced gravity | ||||||||||||||||||||||||||||||||
Authors: |
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Date: | December 2016 | ||||||||||||||||||||||||||||||||
Journal or Publication Title: | npj Microgravity | ||||||||||||||||||||||||||||||||
Refereed publication: | Yes | ||||||||||||||||||||||||||||||||
Open Access: | Yes | ||||||||||||||||||||||||||||||||
Gold Open Access: | Yes | ||||||||||||||||||||||||||||||||
In SCOPUS: | Yes | ||||||||||||||||||||||||||||||||
In ISI Web of Science: | Yes | ||||||||||||||||||||||||||||||||
Volume: | 2 | ||||||||||||||||||||||||||||||||
DOI: | 10.1038/s41526-016-0007-3 | ||||||||||||||||||||||||||||||||
Page Range: | pp. 1-9 | ||||||||||||||||||||||||||||||||
Publisher: | Nature Publishing Group | ||||||||||||||||||||||||||||||||
ISSN: | 2373-8065 | ||||||||||||||||||||||||||||||||
Status: | Published | ||||||||||||||||||||||||||||||||
Keywords: | liquid SiGe semiconductors, thermophysical properties, microgravity, parabolic flight | ||||||||||||||||||||||||||||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||||||||||||||||||||||
HGF - Program: | Space | ||||||||||||||||||||||||||||||||
HGF - Program Themes: | Research under Space Conditions | ||||||||||||||||||||||||||||||||
DLR - Research area: | Raumfahrt | ||||||||||||||||||||||||||||||||
DLR - Program: | R FR - Research under Space Conditions | ||||||||||||||||||||||||||||||||
DLR - Research theme (Project): | R - Vorhaben Materialforschung unter Mikro-g (old) | ||||||||||||||||||||||||||||||||
Location: | Köln-Porz | ||||||||||||||||||||||||||||||||
Institutes and Institutions: | Institute of Materials Physics in Space | ||||||||||||||||||||||||||||||||
Deposited By: | Lohöfer, Georg | ||||||||||||||||||||||||||||||||
Deposited On: | 02 Jan 2017 07:13 | ||||||||||||||||||||||||||||||||
Last Modified: | 17 Nov 2018 05:02 |
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