Abstract
The structure and dynamics of “graphon”, a carbon black, have been characterised by a combination of neutron diffraction and inelastic scattering experiments. The techniques employed were those of neutron diffraction, time-of-flight and beryllium-filter spectroscopy.The dimensions of the unit cell were found to be: a= 2.47 ±(0.01)A, c= 6.93 ±(0.01)A, and the average dimensions of the layer lattice were estimated from high angle diffraction as La= 30 A and Lc= 85 A.Well-defined average phonon groups were observed by inelastic scattering and used to construct an almost sinusoidal dispersion curve for longitudinal acoustic lattice vibrations along the c-axis. The stiffness constant C33, found from the dispersion curve, was 3.00 ±(0.02)× 1011 dyn cm–2. The frequency distribution of the lattice vibrations shows singularities at energies qualitatively in agreement with those calculated by Young and Koppel from specific heat measurements on graphite.
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