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To meet increasing demand for electrical power using solar photovoltaics, millions of tons of solar-grade silicon costing <;$20/kg will be needed. Low-cost solar-grade silicon can be mass produced by burning Na metal in an atmosphere of pure SiF4 gas-an exothermic, fast, and complete reaction. SRI International routinely uses reactors that can produce at rates >20 metric tons per year (mty),...
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