A Solid-State Metathesis Route to MgSiN2

Autor:	Richard B. Kaner, Arthur G. Jun. Anderson, Richard G. Blair
Rok vydání:	2005
Předmět:	business.product_category Silicon Inorganic chemistry chemistry.chemical_element General Medicine Nitride Industrial waste chemistry.chemical_compound Crystallinity Silicon nitride chemistry Impurity Bottle business Fumed silica
Zdroj:	ChemInform. 36
ISSN:	1522-2667 0931-7597
DOI:	10.1002/chin.200527022
Popis:	Nitrides, such as magnesium silicon nitride, hold promise for applications requiring materials with high thermal conductivity. The synthesis of the ternary nitride MgSiN2 is accomplished using SiO2 and Mg3N2 as reactants in a solid-state metathesis (exchange) reaction. This self-propagating reaction is readily initiated when a flame with a temperature ≥1100 °C is brought into contact with a pressed SiO2/Mg3N2 pellet. By using Mg3N2 in ≥1 M excess, X-ray-pure MgSiN2 can be produced. With lower ratios, elemental silicon forms as an impurity. Increasing the flame initiation temperature to ≥2500 °C can also be used to eliminate silicon impurities with the benefit of increasing the crystallinity of the product. The use of other forms of silica as a silicon source provides an inexpensive alternative to produce MgSiN2. A variety of silica sources are examined, including fumed silica, sand, ground quartz, bottle glass, and rice hull ash. Since rice hull ash is an industrial waste product from rice processing, new...
Databáze:	OpenAIRE
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