High-pressure phase silicon nitride having a cubic spinel...

Details High-pressure phase silicon nitride having a cubic spinel... High-pressure phase silicon nitride having a cubic spinel...

2004-04-23

2008-10-21

Vanoy, Timothy C. (Department: 1793)

Chemistry of inorganic compounds

Silicon or compound thereof

Binary compound

C423S406000

Reexamination Certificate

active

07438883

ABSTRACT:
A method for preparing a high-pressure phase cubic spinel-type silicon nitride includes housing a molding containing low-pressure phase silicon nitride powder and a metal powder in a cylindrical container, arranging an explosive in the cylindrical container so as to surround the molding, and exploding the explosive to compress the molding. An X-ray diffraction pattern of the high-pressure phase cubic spinel-type silicon nitride produced according to the method of the present invention shows a maximum peak having a full width at half maximum of 0.65 degrees or less. TG-DTA analysis of the cubic spinel-type silicon nitride shows a weight change starting temperature of 700 to 1100° C.

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Sekine, T., Synthesis and Sintering of Cubic Silicon Nitride (cSi3N4), Review of High Pressure Science and Technology, 13(1):55-60 (Feb. 20, 2003).

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