| Numéro |
J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981
International Conference on Phonon Physics
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|
|---|---|---|
| Page(s) | C6-27 - C6-29 | |
| DOI | https://doi.org/10.1051/jphyscol:1981606 | |
J. Phys. Colloques 42 (1981) C6-27-C6-29
DOI: 10.1051/jphyscol:1981606
THE VIBRATIONAL SPECTRA OF CRYSTALLINE AND AMORPHOUS PHOSPHOROUS
F. Gompf1 et J.S. Lannin21 Kernforschungszentrum Karlsruhe, Institut für Angewandte Kernphysik, D-7500 Karlsruhe, Postfach 3640, F.R.G.
2 Department of Physics, The Pennsylvania State University, University Park, Pennsylvania PA16802, U.S.A.
Abstract
Inelastic neutron scattering measurements are reported on polycrystalline orthorhombic black phosphorous (o-black P) and on amorphous red phosphorous (a-red P). The a-red P results indicate that the vibrational density of states is composed of three distinct spectral bands, with gaps or pseudo-gaps separating these regions. While the high frequency phonon band of o-black P occurs near to that of a-red P, considerable differences exist at lower frequencies. In particular the lowest band in a-red P is less structured and shows a strong shift towards smaller energies i.e. a pronounced softening of the lower part of the a-red spectrum is displayed. The vibrational densities of states have been employed to determine the lattice specific heats and Debye temperatures.