Low-Temperature Nitridation of Manganese and Iron Oxides Using NaNH2 Molten Salt
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- 作者：Akira Miura ; Takahiro Takei ; Nobuhiro Kumada
- 刊名：Inorganic Chemistry
- 出版年：2013
- 出版时间：October 21, 2013
- 年：2013
- 卷：52
- 期：20
- 页码：11787-11791
- 全文大小：291K
- 年卷期：v.52,no.20(October 21, 2013)
- ISSN：1520-510X
文摘
Manganese and iron nitrides are important functional materials, but their synthesis processes from oxides often require high temperatures. Herein, we show a novel meta-synthesis method for manganese and iron nitrides by low-temperature nitridation of their oxides using NaNH2 molten salt as the nitrogen source in an autoclave at 240 掳C. With this method, nitridation of micrometer-sized oxide particles kept their initial morphologies, but the size of the primary particles decreased. The thermodynamic driving force is considered to be the conversion of oxides to sodium hydroxide, and the kinetic of nitridation is improved by the decrease of particle size and the low melting point of NaNH2. This technique as developed here has the advantages of low reaction temperature, reduced consumption of ammonia, employing nonspecialized equipment, and providing facile control of the reactions for producing nitrides from oxides.