Abstract
The results of a study of the structural perfection of crystals and ceramics of lithium niobate and lithium tantalate of various compositions are presented. In solid solutions of the LiNbxTa1-xO3 family with 0.4 ≤ x ≤ 0.6, lines were found in the Raman spectra, both of the first (in the range of 150–900 cm–1) and of the second order, located in the range of 900–2000 cm–1. Second-order Raman lines in the range 900–2000 cm–1 were also recorded by us in single crystals of single-doped lithium niobate and lithium tantalate LiNbO3:Tb (2.24 wt. %), LiTaO3:Cr (0.005 wt. %), and double-doped lithium tantalate LiTaO3:Cr (0.2):Nd (0.45 wt. %). The observed lines in the range 900–2000 cm-1 are explained as a manifestation of overtone processes corresponding to biphonons.
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