Journal
CARBON
Volume 39, Issue 8, Pages 1175-1181Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0008-6223(00)00234-7
Keywords
transmission electron microscopy; electron energy loss spectroscopy; infrared spectroscopy
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We report on the possible synthesis of the theoretically predicted P-phase of carbon nitride (C3N4) by shock compression of sodium dicyanamide mixed with sodium azide and carbon tetra-iodide. Shock-compression experiments were performed on starting precursor blended with similar to 95 wt.% Cu powder, statically pressed in steel capsules. The capsules were impacted under conditions of constant shock amplitude, but varying shock-pulse duration. TEM analysis of the recovered shock compressed residue showed crystallites of a cubic C-N compound dispersed in an amorphous matrix, with overall yield of the crystalline phase being a function of the shock-pulse duration. Parallel-detection electron energy loss spectroscopy of the nitrogen-containing crystallites revealed diamond-like sp(3) bonding. Infra-red spectroscopy indicated absorption lines in regions calculated to be appropriate for beta -C3N4. (C) 2001 Elsevier Science Ltd. All rights reserved.
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