WEB Determination of optimal crystallographic orientations of LiNbO3 and LiTaO3 plates for bimorph actuators of precise positioningTuesday (22.09.2020) 11:35 - 11:50 F: Functional Materials, Surfaces, and Devices 2 Part of:
Actuators of precise positioning allow to activate or control the miniature mechanisms in different engineering devices and systems. In our previous work  the bimorph actuator based on LiNbO3 crystal was investigated. It was manufactured from the oppositely polarized plates of LiNbO3 connected by means of diffusion bonding.The copper film was used to bond the plates. The orientation of the plates used in  was however not optimal (their polar Z axes were perpendicular to bonded surfaces), so the efficiency of this actuator was lower in comparison, e.g. with the one described in . In current work, to ensure the highest possible displacements of the actuator, the optimal orientations of the plates are calculated for LiNbO3 and LiTaO3 crystals. Further, the directions of longitudinal axis of bimorph and electrical field ensuring the maximal elongation/shortening of plates are determined. Finally, the displacements of the optimized actuators were calculated by finite elements method. The results of these calculations were compared with results in  and the actuators based on the commercial plates of LiNbO3 (Y+128o cut) and LiTaO3 (Y+36o cut). It is shown that the optimization allows to significantly increase the actuator displacements – in 26 times for LiNbO3 and 4 times for LiTaO3 comparing to the values obtained for the same geometry as in . In comparison with the actuator realized on commercial plates, the increase of efficiency for about 11 % for LiNbO3 and 66.5 % for LiTaO3 is possible. Generally, the displacements of LiNbO3-actuators are about 3 times higher, than those of LiTaO3.
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