Study of the phase equilibria in the ternary systems X2O-Li2O-Nb2O5(X=Na, Rb, Cs), single crystal growth and characterization of LiNbO3

Abstract : The versatility of the application of LiNbO3 is well-known in the practical fields of acousto-electronics and non-linear optics and electro-optics. The optical damage threshold of stoichiometric LiNbO3 is higher so it is more suitable for electo-optical and non-linear optical applications than the congruent crystal which can be grown easier. The growth difficulties justify the development of alternative preparation methods or the improvement of the existing methods. This emphasizes the importance of the growth of stoichiometric LiNbO3 by the HTTSSG method not only from the K2O - Li2O - Nb2O5 ternary system but from the X2O - Li2O - Nb2O5 (X = Rb, Cs) systems as well. Using the presented phase diagrams the composition of the solution in equilibrium with a custom-tailored crystal composition can be determined. Most of the physical parameters of LiNbO3 are composition dependent. Even a small change of the composition (± 0.01 mol%) causes large differences in the properties so the determination of the Li2O content of the crystal with the highest possible accuracy is very important. The accuracy of the composition determination ? described in detail in my thesis ? based on the intensity ratio of the two characteristic bands in the OH- vibrational spectra of the near stoichiometric LiNbO3 satisfies the requirements imposed by the applications
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Gabriella Dravecz. Study of the phase equilibria in the ternary systems X2O-Li2O-Nb2O5(X=Na, Rb, Cs), single crystal growth and characterization of LiNbO3. Other. Université Paul Verlaine - Metz, 2009. English. ⟨NNT : 2009METZ011S⟩. ⟨tel-01752624⟩

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