Abstract
The cation disorder in stoichiometric and congruent lithium niobate crystals and also in congruent crystals doped with Y3+ or Gd3+ has been studied by X-ray diffraction and Raman scattering spectroscopy using vacancy models. The results indicate that the structural disordering induced by doping with Y3+, revealed by both X-ray diffraction and Raman spectroscopy, can be understood in terms of the mechanism of yttrium incorporation into the cation sublattice of the crystal. Yttrium substitution for Nb5+ on its normal lattice site causes Nb5+ to occupy vacant octahedra, thereby increasing the cation and vacancy disorder along the polar axis and distorting the octahedra because the ionic radius of Y3+ exceeds that of Nb5+.
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Original Russian Text © E.P. Fedorova, L.A. Aleshina, N.V. Sidorov, P.G. Chufyrev, A.A. Yanichev, M.N. Palatnikov, V.M. Voskresenskii, V.T. Kalinnikov, 2010, published in Neorganicheskie Materialy, 2010, Vol. 46, No. 2, pp.247–252.
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Fedorova, E.P., Aleshina, L.A., Sidorov, N.V. et al. Stoichiometry and doping effects on cation ordering in LiNbO3 crystals. Inorg Mater 46, 206–211 (2010). https://doi.org/10.1134/S0020168510020214
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DOI: https://doi.org/10.1134/S0020168510020214