Process was studied in which high-purity silicon (1.07–1.35 ppm) is obtained from powdered technical-grade silicon (99.81–99.86% Si) produced by acid refining to remove impurities by its treatment with gaseous SiF4 at a temperature of 1200°C to give pure SiF2 (gas), with its subsequent decomposition at temperatures lower than 800°C into silicon and SiF4 (gas) circulating in the system.
Russian Journal of Applied Chemistry – Springer Journals
Published: Feb 17, 2012
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