EML Batch 1 - SEMITHERM Experiment (EML Batch 1 - SEMITHERM Experiment) - 12.06.17

Overview | Description | Applications | Operations | Results | Publications | Imagery

ISS Science for Everyone

Science Objectives for Everyone
The SEMITHERM experiment measures the thermophysical properties of liquid semiconductor alloy silicon-germanium (Si-Ge) as a function of temperature.
Science Results for Everyone
Information Pending

The following content was provided by K. Samwer, and is maintained in a database by the ISS Program Science Office.
Information provided courtesy of the Erasmus Experiment Archive.
Experiment Details


Principal Investigator(s)
K. Samwer, Germany

B. Damaschke, Germany
I. Egry, Germany
G. Lohöfer, Germany
Masahito Watanabe, Ph.D., Gakushuin University, Japan
E. Ricci, Italy
E. Arato, Italy
T. Hibiya, Japan
Shunpei Ozawa, Ph.D., Chiba Institute of Technology, Narashino, Japan
T. Tsukuda, Japan
Takao Fujiwara, Kyoto City, University of Arts, Kyoto, Japan
N. Ambrosimov, Germany
H. Riemann, Germany

Astrium GmbH, Bremen, Germany

Sponsoring Space Agency
European Space Agency (ESA)

Sponsoring Organization
Information Pending

Research Benefits
Earth Benefits, Scientific Discovery

ISS Expedition Duration
March 2014 - September 2014

Expeditions Assigned

Previous Missions
Information Pending

^ back to top

Experiment Description

Research Overview
The SEMITHERM experiment takes a closer look at a material that made mobile technology ubiquitous: silicon–germanium (Si-Ge) semiconductors. These computer chips are found in almost all smartphones, and creating the chips requires forming the alloy at specific temperatures. SEMITHERM is set to investigate the underlying properties of a mix of silicon and germanium as it melts in microgravity to see how microgravity affects the results.

Information Pending

^ back to top


Space Applications
Industry partners to the projects seek to optimize ground processes, and have a direct interest in the knowledge that is gained from the experiments. This can, in turn, find its way into the development of new light-weight, high-performance structural materials for space applications.

Earth Applications
Investigations carried out with the Electro-Magnetic Levitator (EML) provide both reference data on thermophysical properties and microstructure formation for the same metallic alloy samples. (The microstructure in an alloy influences its characteristic properties such as strength, flexibility and resistance to fatigue). This information is of importance for feeding accurate data into current numerical models on one side, and also testing these models aiming to predict the solidification profile and related microstructure formation in the alloy samples. This concerns structural steels, magnetic materials, intermetallic materials, glass forming metallic alloys etc.

^ back to top


Operational Requirements and Protocols
After container installation by crew, all activities are fully commanded by ground. Sample processing is executed during crew sleep, with continuous Ku and S band coverage so that micro-g-level and vibrations are known. One run per sample, with several melting cycles. Exact number of melting cycles for this experiment is still to be determined.

^ back to top

Decadal Survey Recommendations

Applied Physical Science in Space AP9
Applied Physical Science in Space AP10

^ back to top

Results/More Information

Information Pending

^ back to top

Related Websites

^ back to top