✍ Scribed by Laurence A.J. Garvie; Hervé Hubert; William T. Petuskey; Paul F. McMillan; Peter R. Buseck
No coin nor oath required. For personal study only.
Materials with structures related to that of -rhombohedral B ( -rh B) were synthesized in the B-C-N-O system at high pressures and temperatures. Electron energy-loss spectroscopy with a transmission electron microscope was used to determine the stoichiometry of these phases. The energy-loss near-edge structure of the core-loss edges provided qualitative information on the bonding and local band structure. Extensive solid solution between B 4 C and B 6 O was found in some of the syntheses as well as nanorods with composition near B 6 C in one experiment. The analysis of the new -rh B-type material, nominally B 6 N, provided a mean composition of B 6 N 0.92 . The B K edge from B 6 N is similar to that from other icosahedral boron-rich phases, more specifically to B 6 O, although differences near the conductionband onset reveal a high level of unoccupied states within the band gap.
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The reaction of O-atoms with cyanogen was studied behind reflected shock waves using mixtures of nitrous oxide and cyanogen dilute in argon (10/100, 15/150, and 30/300 ppm N20/ppm C2N2, with temperatures in the range 1780 \_< T ~ 2285K and pressures of about 1.9 bar. Generation of O-atoms was achiev
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