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Shock Wave Chemical Reactions; Synthesis of Carbon Nitrides

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Abstract:

A series of shock recovery experiments up to ~50 GPa were performed on reactions to form carbon nitrides. Nitrogen-rich starting materials, included a C-N-O amorphous precursor, dicyandiamide, melamine, and a mixture of carbon tetrahalide and sodium dicyanoamide, were used and the recovered samples were investigated by X-ray diffraction technique, elemental analysis, transmission electron microscopy and so on. Experimental results showed formation of a new carbon nitride, high stability of melamine up to a shock pressure of 37 GPa, and production of amorphous C-N materials with a highest N/C ration of 1.26 from the reaction between carbon tetrahalide and sodium dicyanoamide. We extended to the system C3N4-Si3N4 based on the recent results on synthesis of spinel-type nitrides. Shock wave chemical reactions provide a route for synthesizing novel materials including not only high-pressure phases but also metastable, unique substances.

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Periodical:

Materials Science Forum (Volume 566)

Pages:

125-128

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.566.125

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Online since:

November 2007

Authors:

Toshimori Sekine

Keywords:

Amorphous Materials, Carbon Nitride, Carbon Tetrahalide, Dicyandiamide, Melamine, Shock Wave Synthesis, Sodium Dicyanoamide

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© 2008 Trans Tech Publications Ltd. All Rights Reserved

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