Structure and properties of single crystals of tin-doped potassium titanyl phosphate |
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| Authors: | O D Krotova N I Sorokina I A Verin V I Voronkova V K Yanovskii V I Simonov |
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| Institution: | (1) Moscow State University, Vorob’evy gory, Moscow, 119992, Russia;(2) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russia |
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| Abstract: | Single crystals with the compositions KTi0.47Sn0.53OPO4 and KTi0.25Sn0.75OPO4 were grown by spontaneous crystallization from flux in the K2O-TiO2-SnO2-P2O5 quaternary system, and their structures were established from precision X-ray diffraction data. The incorporation of tin into the crystals lowers the asymmetry of cation positions in the (Ti,Sn)O6 octahedra. The addition of even a small amount (x < 0.4) of tin to the K(Ti1 ? x Snx)OPO4 crystals causes fast symmetrization of the octahedra. The process slows down with an increase in the tin content until the attainment of the composition KSnOPO4 and localization of tin in the centers of octahedra. It is these structural features that are responsible for a decrease in the optical nonlinearity of the crystals and in the intensity of second harmonic generation by laser radiation in these crystals. |
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