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Preparation of magnesium silicon nitride powder by the carbothermal reduction technique

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Magnesium silicon nitride (MgSiN2) powder was prepared by carbothermally reducing a magnesium metasilicate whose chemical composition corresponded to MgO SiO2 or MgSiO3. About 0.2 g of the powder mixture of magnesium metasilicate and carbon (C) with the molar ratio of C to MgO SiO2 equal to 6.0 was heated at 1250°C for 7 h in nitrogen atmosphere. The crystalline phase of the carbothermally reduced powder was only MgSiN2. The residual carbon could be removed by heating the powder at 600°C for 1 h in air. The yield of MgSiN2 powder was ~ 70%. The resulting powder contained 3.22 mol% oxygen. The primary particle sizes were ranging from 0.1 to 0.5 μm.

Affiliations: 1: Department of Chemistry, Faculty of Science and Engineering, Sophia University, 7-1 Kioi-cho, Chiyoda-ku, Tokyo 102-8554, Japan


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