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Low-energy Electron Exposure Effects on the Optical Properties of ZnO/K2SiO3 Thermal Control Coating

Published online by Cambridge University Press:  31 January 2011

X. D. Wang ,
S. Y. He  and
D. Z. Yang
X. D. Wang*
Affiliation:
Space Materials & Environment Engineering Lab, Harbin Institute of Technology, P.O. Box 432, Harbin 150001, People's Republic of China
S. Y. He
Affiliation:
Space Materials & Environment Engineering Lab, Harbin Institute of Technology, P.O. Box 432, Harbin 150001, People's Republic of China
D. Z. Yang
Affiliation:
Space Materials & Environment Engineering Lab, Harbin Institute of Technology, P.O. Box 432, Harbin 150001, People's Republic of China
*
a)Address all correspondence to this author. e-mail: xiudun@xinhuanet.com
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Abstract

An experimental investigation was undertaken to study low-energy electron exposure effects upon ZnO/K2SiO3 thermal control coating. The specimens were exposed to 10-, 30-, 50-, and 70-keV electrons, respectively. The spectral reflectance of each specimen was measured in situ before and after electron exposures. The solar absorptance was calculated by assuming a Johnson solar spectral irradiance distribution. Electron paramagnetic resonance and photoluminescence measurements were made before and after electron exposures to explain physical changes induced by the electron exposures. All the specimens exhibited a reflectance decrease throughout the visible and the near-infrared regions, and also the induced optical degradation was found to be electron energy dependent, with increased damage for increasing electron energy. It is believed that the optical degradation of ZnO/K2SiO3 thermal control coating, induced by the low-energy electron exposures, is mainly due to the ionization process of the ZnO pigment.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 7 , July 2002 , pp. 1766 - 1771
Copyright
Copyright © Materials Research Society 2002

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