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|Section2= |Section7= |Section8= }} Magnesium silicide, Mg2Si, is an inorganic compound consisting of magnesium and silicon. As a powder magnesium silicide is dark blue or slightly purple in color. ==Synthesis== The material is prepared by combining silicon and magnesium in a 2:1 proportion. It can be produced by heating silicon dioxide, SiO2, found in sand, with excess magnesium. The process first forms silicon metal and magnesium oxide, and, if an excess of magnesium is used, the silicide is formed: :2 Mg + SiO2 → 2 MgO + Si If an excess of Mg is present, Mg2Si is formed from the reaction of the remaining magnesium with the silicon via: :2 Mg + Si → Mg2Si Hence, the overall reaction for the formation of magnesium silicide from a 4:1 Mg:SiO2 molar ratio may be represented as: :4 Mg + SiO2 → 2 MgO + Mg2Si These reactions proceed exothermically.〔P. Ehrlich "Alkaline Earth Metals" in Handbook of Preparative Inorganic Chemistry, 2nd Ed. Edited by G. Brauer, Academic Press, 1963, NY. Vol. 1. p. 920.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Magnesium silicide」の詳細全文を読む スポンサード リンク
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