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Abstract
The optical phonon modes of stoichiometric lithium niobate crystals have been studied by Raman scattering measurements. The results were compared with that of congruent and 5 mol% Mg doped crystals. It is found that the mode frequency shows no remarkable composition difference, while the damping shows the marked change. The temperature dependences of the damping of A1(z) modes were measured, and the damping due to the scattering at defects was determined by the subtraction of the anharmonic damping. The type of defects which scatter optical phonons were discussed in relation to the Li and Nb sites vacancy models. The results shows that the Nb site vacancy model is inadequate and the doped Mg atoms occupies the Li site.
