XRD studies and dielectric measurements of BaTiO_3 single crystals in applied electrostatic fields up to 5.5 centre dot 10~7 V/m have been conducted. From the observed unit-cell parameter variation as a function of the applied field E, the E-dependence of the piezoelectric coefficient d_(33) has been evaluated. In the applied field range studied, the piezoelectric coefficient and dielectric permittivity have been found to change by a factor of 2. The observed nonlinear behavior is to a good approximation described by an expression which relates the dielectric characteristics of BaTiO_3 crystals to the electromechanical ones.
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机译：进行了X射线衍射研究和BaTiO_3单晶在施加的静电场中的测试，该场高至5.5个中心点10〜7 V / m。从观察到的随施加电场E变化的晶胞参数变化，已经评估了压电系数d_（33）的E依赖性。在研究的应用范围内，发现压电系数和介电常数变化了2倍。观察到的非线性行为是一个良好的近似值，该表达式通过将BaTiO_3晶体的介电特性与机电特性相关联的表达式来描述。
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