Abstract
Bidomain single crystals of lithium niobate (LiNbO3) and lithium tantalate (LiTaO3) are promising material for usage as actuators, mechanoelectrical transducers and sensors working in a wide temperature range. It is necessary to take into account anisotropy of properties of crystalline material when such devices are designed. Inthis study we investigated deformations of bidomain round shapedY+ 128°-cut wafers of lithium niobate in an external electric field. Dependencies of piezoelectric coefficients on rotation angles were calculated for lithium niobate and lithium tantalate and plotted for the crystal cuts which are used for bidomain ferroelectric structure formation. In experiment, we utilized external heating method and long-time annealing with lithium out-diffusion method in order to create round bidomain lithium niobate wafers. In order to obtain dependencies of the bidomain crystals’ movements on the rotation angle with central fastening and external electric field application optical microscopy was used. We also modeled a shape of the deformed bidomain wafer with a suggestion that the edge movement depends on the radial distance to the fastening point quadratically. In conclusion, bidomainY+ 128°-cut lithium niobate wafer exhibits saddle-like deformation when DC electric field is applied.
Highlights
Bidomain single crystals of lithium niobate (LiNbO3) and lithium tantalate (LiTaO3) are promising material for usage as actuators, mechanoelectrical transducers and sensors working in a wide temperature range
In this study we investigated deformations of bidomain round shaped Y + 128°−cut wafers of lithium niobate in an external electric field
Dependencies of piezoelectric coefficients on rotation angles were calculated for lithium niobate and lithium tantalate and plotted for the crystal cuts which are used for bidomain ferroelectric structure forma
Summary
При приложении электрического поля пластина бидоменного кристалла деформируется аналогично биморфу: один из доменов удлиняется, а другой укорачивается. 2. Зависимости пьезоэлектрических модулей d23 ниобата лития (1) и танталата лития (2) от угла поворота вокруг оси X. Можно определить оптимальный угол среза кристалла для изготовления пьезоэлектрического актюатора Рассмотрим зависимость пьезоэлектрического модуля d23 от второго поворота на угол φ вокруг оси Y′. 3 хорошо видно, что поперечный пьезомодуль меняет знак в плоскости пластины Y + 128°−среза ниобата лития. Что при приложении электрического поля к такой пластине она удлиняется в одном и укорачивается в другом направлении. Рассмотрим теперь угловую зависимость пьезокоэффициента d23 для пластины Y + 36°−среза танталата лития. 3. Зависимости значения поперечного пьезоэлектрического модуля d23 от поворота в плоскости пластины для Y + 128°−среза LiNbO3 (a) и Y + 36°−среза LiTaO3 (б): а: 1 — d23 < 0; 2 — d23 > 0; б: 1 — d23 < 0.
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More From: Izvestiya Vysshikh Uchebnykh Zavedenii. Materialy Elektronnoi Tekhniki = Materials of Electronics Engineering
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