Lattice dynamics of trigonal selenium. II. Model theories
- 21 November 1975
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 8 (22) , 3737-3751
- https://doi.org/10.1088/0022-3719/8/22/014
Abstract
For pt.I see ibid., vol.8, p.3725 (1975). Phonon dispersion curves of trigonal selenium (Se) were studied using a valence force field model (VFFM) and a shell model (SM) with anisotropic core-shell coupling constants. The interchain coupling of the VFFM arises largely from forces representing interactions between adjacent bonds, suggesting covalent interchain bonding. Long range forces exist especially along the chains for the SM, which also gives correct values for the LO-TO splitting of the i.r. active A2 and E2 modes and the associated effective charges and also the low and high-frequency dielectric constants.Keywords
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