The Dependence of Grain Size of Silicon from Rice Husk Ash on Metallothermic Reaction Time

摘要

This paper presents the influence of metallothermic reaction time on the grain size of silicon from rice husk ash. The silicon was produced by the metallothermic reaction of silica which is isolated from rice husk ash and aluminum at 620°C for reaction time varies at 3 hours, 4 hours, 5 hours and 6 hours and continued with purification of the products using acid hydrolysis method. The results of the crystallite size determination, obtained from profile analysis of XRD peaks, were indicated a tendency that the size increases as the reaction time increase, however, presumably the samples did not experience the grain growth significantly due to impurity contents.