Amorphous silicon is a gray-black powder and is actually a microcrystal.
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In industry, metallic silicon is usually produced by carbon reduction of silicon dioxide in electric furnaces. Chemical reaction equation: SiO2 + 2C → Si + 2CO The purity of silicon produced in this way is 97~98%, which is called metallic silicon. Then it is melted and recrystallized, and impurities are removed with acid to obtain metallic silicon with a purity of 99.7~99.8%.
A:Always a pre-production sample before mass production;
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