Shock-wave-induced phase transition in C:N filmsстатья
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Дата последнего поиска статьи во внешних источниках: 19 сентября 2015 г.
Аннотация:New data on the phase transition in C:N films during shock wave compression are discussed. The initial films were obtained by ion-assisted carbon condensation method under the conditions of nitrogen-carbon glow discharge. Electron diffraction patterns of these films are characterized by a broad diffraction maximum d = 3.79 Å. The structure of the films can be interpreted in terms of densely packed carbon chain clusters (a = 4.38 Å). These films were subjected to impulse compression at 14 GPa in recovery experiments (duration of compression impulse is 2 μs). The electron diffraction investigation shows that under these conditions partial crystallization of the specimen takes place. The mean size of crystallites is about 1 μk. The crystal lattice is of hexagonal type with a = 4.38 Å, which coincides with diffraction maximum of the initial film and demonstrates the crystallization of an amorphous phase. Electron diffraction pattern treatment by the Patterson function method have yielded the (001) projection of charge density distribution. This C:N phase significantly differs from that predicted theoretically. By Auger Electron spectroscopy and carbon KVV Auger lineshape deconvolution treatment the distribution of electron density in the valence band of C:N films was performed.