HIGH-PRESSURE CRYSTAL PHASE OF CARBON NITRIDE

The existence of the hard phase C3N4 carbon nitride is under dispute. The conditions needed for high pressure/high temperature synthesis of this hard phase include increasing the nitrogen content by using azide s and the elimination of hydrogen from the starting material. Graphiti c type CNx materials have been synthesized by a microwave nitrogen pla sma CVD process. The material possesses turbostratic structure A = 2.6 0 Angstrom, C = 7.28 Angstrom and presumably has vacancies in the basa l planes.