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Shock Wave Synthesis and Exploration of High-pressure Nitrides and Related Materials

Published online by Cambridge University Press:  01 February 2011

Toshimori Sekine
Toshimori Sekine*
Affiliation:
sekine.toshimori@nims.go.jp, National Institute for Materials Science, Nano Materials Lab, Namiki 1-1, Tsukuba, 305-0044, Japan, +81-29-860-4408
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Abstract

We have successfully developed a method to manufacture spinel-type Si3N4 and also a chemical treatment method to separate the spinel-type phase from the low-pressure phases. Similar methods could be applied for the SiAlON systems. In order to explore high-pressure nitrides and oxynitrides, we extended toward the system Si3N4-AlN-Al2O3- SiO2. According to the results of in situ measurements of the high-pressure behavior up to pressures of 200 GPa, there appears to be post-spinel phase in the system. This is consistent with the results from the first principles calculations. However we could not obtain the post-spinel phase by the shock recovery experiments at present. We also carried out shock recovery experiments on carbon nitrides and related materials. 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 tried further to extend toward the systems C3N4-Si3N4 and Mg2SiO4-Si3N4, after taking into account the results on shock synthesis of spinel-type nitrides.

Keywords

nitridephase transformationchemical synthesis
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1040: Symposium Q – Nitrides and Related Bulk Materials , 2007 , 1040-Q05-04
Copyright
Copyright © Materials Research Society 2008

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References

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