Abstract
The paper studies the reflectivity and radiation resistance of calcium carbonate, which is often an accompanying component of wollastonite, a promising material as a pigment for spacecraft thermal control coatings. Synthetic calcium carbonate of the calcite modification was obtained in an aqueous medium, its phase composition, morphology and particle size were investigated. The study was carried out on a facility simulating outer space conditions, under irradiation of CaCO3 powders with accelerated electrons with an energy of 30 keV and a fluence of 1·1016, 2·1016 and 3· 1016 cm−2. The spectra recording before and after the irradiation periods was conducted in vacuum in situ, which allows avoiding the interaction of irradiation-induced defects with atmospheric gases. A negligible optical degradation of calcite in the wavelength region of 250 and 600 nm is observed during irradiation, while the structure of CaCO3 does not undergo noticeable degradation according to IR spectroscopy.
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