Abstract
Using inelastic neutron scattering we have determined all the dispersion branches of the Λ1, Λ2 and Λ3 representations along the three-fold axis as well as the 2 times 15 branches of Σ1 and Σ2 symmetry along the Г-A-direction plus some branches along the Г-D-direction. The experimental data are analyzed using various rigid ion, polarizable ion and shell models. The shell models give a very satisfactory account of the dispersion curves as well as the scattering intensities. Special attention is given to the investigation of dielectric constants and equilibrium conditions.
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Schober, H., Strauch, D. & Dorner, B. Lattice dynamics of sapphire (Al2O3). Z. Physik B - Condensed Matter 92, 273–283 (1993). https://doi.org/10.1007/BF01308745
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DOI: https://doi.org/10.1007/BF01308745