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A Variable-Emittance Radiator Based on a Metal-Insulator Transition of (La,Sr)MnO3

Published online by Cambridge University Press:  11 February 2011

Yuichi Shimakawa ,
Tsutomu Yoshitake ,
Yoshimi Kubo ,
Takahiko Machida ,
Kiminari Shinagawa ,
Akira Okamoto ,
Yasuyuki Nakamura ,
Atsushi Ochi ,
Sumitaka Tachikawa  and
Akira Ohnishi
Yuichi Shimakawa
Affiliation:
Fundamental Research Laboratories, NEC Corporation, Tsukuba 305–8501, Japan
Tsutomu Yoshitake
Affiliation:
Fundamental Research Laboratories, NEC Corporation, Tsukuba 305–8501, Japan
Yoshimi Kubo
Affiliation:
Fundamental Research Laboratories, NEC Corporation, Tsukuba 305–8501, Japan
Takahiko Machida
Affiliation:
Department of Physics, Toho University, Funabashi 274–8510, Japan
Kiminari Shinagawa
Affiliation:
Department of Physics, Toho University, Funabashi 274–8510, Japan
Akira Okamoto
Affiliation:
NEC TOSHIBA Space Systems, Ltd., Yokohama 224–8555, Japan
Yasuyuki Nakamura
Affiliation:
NEC TOSHIBA Space Systems, Ltd., Yokohama 224–8555, Japan
Atsushi Ochi
Affiliation:
Functional Materials Research Laboratories, NEC Corporation, Kawasaki 216–8555, Japan
Sumitaka Tachikawa
Affiliation:
Institute of Space and Astronautical Science, Sagamihara 229–8501, Japan
Akira Ohnishi
Affiliation:
Institute of Space and Astronautical Science, Sagamihara 229–8501, Japan
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Abstract

Variable-emittance radiators based on the metal-insulator transition of (La,Sr)MnO3 have been developed. The emittance property of the material was evaluated from infrared reflectance spectra; that is, (La,Sr)MnO3 shows low emittance at low temperature but high emittance at high temperature. Moreover, the emittance property significantly changes at the metal-insulator transition temperature, where the material changes from a highly reflective (i.e., low emissivity) metal to a less reflective (i.e., high emissivity) insulator. The (La,Sr)MnO3 thin-films fitted on a spacecraft surface can, therefore, be used to automatically control the emmisive heat transfer from the spacecraft without the need for electrical power. The developed (La,Sr)MnO3 thin-film radiator also greatly reduces the weight and production cost of the thermal control devices.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 755: Symposium DD – Solid-State Chemistry of Inorganic Materials IV , 2002 , DD11.13
Copyright
Copyright © Materials Research Society 2003

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References

REFERENCES

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