Vibrational spectra of disordered chains and the structure of amorphous Se and Te
- 1 November 1976
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 34 (5) , 767-774
- https://doi.org/10.1080/14786437608222048
Abstract
The vibrational spectra of a series of disordered two-fold coordinated chains of atoms, calculated using bond stretching and bending forces only, are presented. The disorder is included by a distribution in the dihedral angle, the bond angles being set at the value for crystalline Se. Comparison of the results with experimental data for a-Se indicates the existence of a preferred magnitude for the dihedral angle along chain-molecular units. Further considerations suggest the sign of the dihedral angle is constant or random and may be distributed about the crystalline value with a standard deviation up to a maximum of about 10°. It is likely that this distribution is broader in a-Te than in a-Se.Keywords
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