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

  • Yuichi Shimakawa (a1), Tsutomu Yoshitake (a1), Yoshimi Kubo (a1), Takahiko Machida (a2), Kiminari Shinagawa (a2), Akira Okamoto (a3), Yasuyuki Nakamura (a3), Atsushi Ochi (a4), Sumitaka Tachikawa (a5) and Akira Ohnishi (a5)...

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.

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

  • Yuichi Shimakawa (a1), Tsutomu Yoshitake (a1), Yoshimi Kubo (a1), Takahiko Machida (a2), Kiminari Shinagawa (a2), Akira Okamoto (a3), Yasuyuki Nakamura (a3), Atsushi Ochi (a4), Sumitaka Tachikawa (a5) and Akira Ohnishi (a5)...

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