Properties of high-temperature poling ferroelectric crystals congruent solid solution LiNb0.5Ta0.5O3

Lithium niobate and lithium tantalate are among the most important and most widely used materials in acousto-optics and acoustoelectronics. These materials have high values of piezoelectric constants, which makes it possible to use these materials as actuators; however, their use is limited by the thermal instability of a lithium niobate crystal and the low Curie temperature (T_C) of a lithium tantalate crystal. LiNb_(1-x)Ta_xO₃ crystals have to overcome the aforementioned limitations of individual compounds.

Crystals LiNb_0.5Ta_0.5O₃ were grown by the Czochralski method, of good quality. Comparative studies of the features of high-temperature single domainization of LiNb_0.5Ta_0.5O₃ crystals have been carried out. The main differences in the technological regimes for single-domainization of congruent LiNb_0.5Ta_0.5O₃ crystals from congruent LiNbO₃ crystals are demonstrated. The parameters of high-temperature electrodiffusion processing LiNb_0.5Ta_0.5O₃ crystals are presented, which make it possible to obtain single-domain crystals for further study of their physical properties.

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