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Low-temperature Nitridation Method Using Sodium Amide

Nitride and oxynitride synthesis without using ammonia gas cylinder

This is a method used to convert oxides and other materials into nitrides and oxynitrides at low temperatures (300°C or less) by using a sodium amide melt to trigger a reaction with a highly concentrated and active nitrogen source. Nitrides and oxynitrides can be synthesized without having to prepare toxic ammonia gas cylinders.

Research

This is a new method for nitridation of oxides at low temperatures (300℃ or less). Conventional nitridation methods require the installation of toxic ammonia gas cylinders and toxic ammonia gas recovery facilities, and also use a large amount of ammonia due to the low ammonia gas usage rate. With the present method, the use of sodium amide as a flux minimizes the use of toxic ammonia and makes it possible to obtain oxynitride and nitride nanocrystals at low temperatures. Since sodium amide is a solid nitrogen source, it eliminates the need to install ammonia liquid cylinders. We have also discovered a method to synthesize oxynitrides by mixing chloride and sodium amide through an instantaneous temperature-programmed reaction.

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Akira Miura Professor

Faculty of Engineering

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