太陽炉を利用したマグネシウムによる二酸化ケイ素の還元とその教材化

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タイトル別名
  • Reduction of SiO<sub>2</sub> by Mg Using a Solar Furnace and Its Application to Teaching Materials
  • タイヨウロ オ リヨウ シタ マグネシウム ニ ヨル ニサンカ ケイソ ノ カンゲン ト ソノ キョウザイカ

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説明

We produced a pure Si substance directly from a SiO2-Mg system using the solar furnace in the air. After the reagent of SiO2-Mg system was melting for 2–3 minutes under the solar furnace, Si grains (~1–3 mm) surrounded by forsterite (Mg2SiO4) were produced as the reaction product. From the phase diagram of MgO-SiO2 system, it is considered that the reaction, 2 SiO2 + 2 Mg → Si + Mg2SiO4, occurred. In this reaction, the existence of Mg2SiO4 melt might have protected Si reduced from SiO2 against O2 in the air, and might have made Si grain grow larger in the melt. In the reduction of SiO2 by Mg, we could have obtained Si grains visible to the naked eye within a few minutes under the solar furnace. Being a simple and short experiment this experiment is suitable for science students.

収録刊行物

  • 科学教育研究

    科学教育研究 40 (1), 39-45, 2016

    一般社団法人 日本科学教育学会

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