Nanocages of layered BN: Super-high-pressure nanocells for formation of solid nitrogen

Golberg, D.; Bando, Y.; Sato, T.; Grobert, N.; Reyes-Reyes, M.; Terrones, H.; Terrones, M.
May 2002
Journal of Chemical Physics;5/15/2002, Vol. 116 Issue 19, p8523
Academic Journal
We observed high N contents inside BN fullerenelike multilayered nanocages (ca. 30-100 nm) formed by reacting CN[sub x] nanotubes (x≤0.1) and B[sub 2]O[sub 3] in a N[sub 2] atmosphere at 1985-2113 K. High-resolution transmission electron microscopy (HRTEM), electron energy loss spectroscopy, energy dispersion x-ray spectroscopy, electron diffraction analysis, spatially resolved energy-filtered TEM, and in situ TEM electron irradiation studies suggest that super-high pressures (of several GPa) are generated inside nanocages, responsible of crystallizing gaseous nitrogen trapped within the BN shells. In addition, high-pressure-induced phase transformation of graphitic-like BN into diamond-like cubic BN occurs inside the nanocages. Thus, BN nanocages play an unusual role of super-high-pressure nanocells.


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