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建立起高压介电测试装置和相应的数据处理方法。研究了 PZT/P(VDF- Tr FE)和 PT/P(VDF- Tr FE) 0 - 3型铁电复合物厚片介电系数的电场依赖性。对于陶瓷体积分数 φ>0 .3的复合物 ,介电系数随测试场强的升高明显增大。在 φ<0 .1时 ,可用 Maxwell- Garnett方程拟合试验结果。Bruggeman方程适合于低电场 (<1 MV/m)下复合物介电系数的预测。通过 Lz的变化 ,用 Yamada模型可拟合复合物介电系数随电场变化的关系 ,说明 Lz是由复合物的组分维数、粒子形状以及粒子间静电相互作用所决定的参数。
Establish a high-voltage dielectric test device and the corresponding data processing methods. The electric field dependence of the dielectric permittivity of the PZT / P (VDF-Tr FE) and PT / P (VDF-Tr FE) 0-3 ferroelectric composites was investigated. For the ceramic volume fraction φ> 0. 3 of the composite, the dielectric coefficient increases significantly with the test field strength. At φ <0 .1, the Maxwell-Garnett equation can be used to fit the test results. The Bruggeman equation is suitable for the prediction of the dielectric constant of composite under low electric field (<1 MV / m). Through the variation of Lz, the relationship between the dielectric constant of the composite and the electric field can be fitted by the Yamada model, which shows that Lz is a parameter determined by the composition dimension of the composite, the particle shape and the electrostatic interaction between the particles.