Abstract:The crystal structure, phonon spectrum, and elastic constants of a series of rare-earth germanates (including yttrium germanate R 2 Ge 2 O 7 (R = Tb-Lu, Y)) with a tetragonal structure have been ab initio calculated within the density functional theory. The frequencies and types of fundamental vibrations and the intensities of IR and Raman modes are determined. The degrees of participation of ions in each mode are determined by analyzing the displacement vectors obtained as a result of the ab initio calculatio… Show more
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