一种具有大电致伸缩效应的陶瓷材料弛豫铁电体PZT:La被我们发现了。电致伸缩也是一种基本的机-电耦合效应。由于S=ME~2,它是个二次方函数,因此所产生的机-电耦合是一个非线性效应。通过实验我们观察到了电致伸缩所特有的非线性机-电转换功能。利用双晶片的弯曲振动模式可以制造出结构简单、成本低廉的电声倍频器、混频器,可适用于整个低频范围。 A kind of relaxor ferroelectrics PZT: La with large electrostrictive effect was discovered by us. Electrostriction is also a basic mechanical-electrical coupling effect. Since S = ME ~ 2, which is a quadratic function, the resulting machine-to-electrical coupling is a non-linear effect. Through experiments, we observed the non-linear electromechanical electromechanical conversion function. The use of dual-chip flexural vibration mode can be made of simple structure, low cost of electro-acoustic multiplier, mixer, can be applied to the entire low-frequency range.