Abstract
Lithium niobate and tantalate are among the most important and widely used materials of acoustooptics and acoustoelectronics. They have high piezoelectric constants enabling their use as actuators. Their use is however restricted by the thermal instability of lithium niobate crystals and the low Curie temperature TC of lithium tantalate crystals. Overcoming these drawbacks typical of some compounds is possible by growing LiNb1-xTaxO3 single crystals. Good quality LiNb1-xTaxO3 single crystals have been grown using the Czochralsky technique. High-temperature poling process of LiNb1-xTaxO3 single crystals has been studied. The main differences between the process modes required for poling of congruent LiNb1-xTaxO3 single crystals and congruent LiNbO3 single crystals have been demonstrated. Parameters of high-temperature electric diffusion processing of LiNb1-xTaxO3 single crystals that provide for singledomain crystals for further study of physical properties have been reported.
Highlights
The development of acoustooptic devices for real time transmission and processing of acoustic signals is mainly fueled by the search for new materials having good acoustic properties [1,2,3]
From this viewpoint of great interest are ferroelectric crystals of LiNbO3 and LiTaO3. These materials have high piezoelectric constants enabling their use as actuators [4,5,6]. Their use is restricted by the thermal instability of lithium niobate crystals and the low Curie temperature TC of lithium tantalate crystals
Results for Czochralsky growth of LiNb1-xTaxO3 single crystals were reported [10] and the size and quality of the crystals enabled a study of their structure and physical properties
Summary
The development of acoustooptic devices for real time transmission and processing of acoustic signals is mainly fueled by the search for new materials having good acoustic properties [1,2,3]. From this viewpoint of great interest are ferroelectric crystals of LiNbO3 and LiTaO3. The most interesting and complex task is poling of solid solution crystals with a 1 : 1 ratio of the isomorphic cations into a single-domain state because their high-temperature poling process parameters will differ strongly from those of the edge-composition LiNbO3 and LiTaO3 compounds
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