Abstract
Measurements have been made on the phase composition, valence-band electron-energy structure, the substructure, and the lattice parameters. Internal stresses have been determined in the BNsp polycrystalline materials sintered in shock waves with various pressures at the fronts. The NKα spectra show that the valence bands are shifted to energies that correspond to points of high symmetry U1 and K1 in the Brillouin zone. They represent sp hybridized states, which participate in direct bonds between the closest boron and nitrogen atoms. The reduction in the electron-state spaces in these energy regions is related to the internal stresses, which attain some gigapascals. These arise from the formation of point and line defects. The type of defect has a marked effect on the internal-stress sign and level.
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Translated from Poroshkovaya Metallurgiya, No. 7, pp. 94–101, July, 1993.
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Kovtun, V.I., Petrenko, A.V., Zaulichnyi, Y.V. et al. Valence-band electron structure in polycrystalline cubic boron nitride sintered in shock waves. Powder Metall Met Ceram 32, 645–650 (1993). https://doi.org/10.1007/BF00559952
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DOI: https://doi.org/10.1007/BF00559952