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Stability of Carbon Nitride Materials at High Pressure and Temperature

Summary: Stability of Carbon Nitride Materials at High
Pressure and Temperature
Andrew J. Stevens, Takaaki Koga, Carl B. Agee,
Michael J. Aziz, and Charles M. Lieber*,,
Department of Chemistry and Chemical Biology
DiVision of Engineering and Applied Sciences
Department of Earth and Planetary Sciences
HarVard UniVersity, Cambridge, Massachusetts 02138
ReceiVed July 22, 1996
High-pressure and -temperature techniques are commonly
used to probe dense and hard solid phases,1,2 although their use
in the synthesis of potentially ultrahard carbon nitride materials
has been relatively unexplored. Herein, we report the first
mapping of the pressure-temperature-composition diagram for
a prototypical sp2-bonded amorphous carbon nitride material.
Experiments were carried out using piston-cylinder and mul-
tianvil presses at pressures up to 20 GPa and temperatures up
to 2000 C. These studies demonstrate that the carbon nitride
material undergoes an irreversible decomposition into carbon
and molecular nitrogen at a well-defined temperature that


Source: Aziz, Michael J.- School of Engineering and Applied Sciences, Harvard University


Collections: Physics; Materials Science