在研制由钨青铜型压电陶瓷分立驱动器组装成特种圆环状压电驱动器中，发现组装后横向位移模圆环驱动器的位移量呈现异常的变化；它的位移量比分立器件的增加可达～３０％．对组成、器件制备等进行了大量实验，分析认为；分立器件在组装后处于严重的压应力中，它对逆压电效应的影响是上述结果的原因．它的主要机制是在压应力下通过９０°畴重新取向或钨青铜结构中基本组元－氧八面体的畸变使自发极化偏离于原压应力方向，一旦施加电场则造成位移量的大大增加．
Unusual increase of displacement in special ring type piezoelectric ceramic actuators with transverse mode was found, which were made from three discrete
actuators using piezoelectric ceramics with tungsten bronze structure. The increasing values of displacement were as high as about 30%, as
compared with the composing discrete one. The discrete actuators are in press stress according to analyses and experiments, and the unusual
phenomenon is related to their stress condition. This mechanism can be described as follows: under the press stress the spontaneous polarization
Ps will departure from original direction (the pressure direction), due to some 90° domains reorientation or some distortion of oxygen-
octahedras in tungsten bronze structure, then as soon as electrical field E is applied, the Ps will return the original directions, that leads to
the increment of strain for the ring type actuator.
参考文献
| [1] | 陈大任，李国荣(CHEN Da-Ren, { et al). 无机材料学报(Journal of Inorganic Materials)， 1998， 13 (4): 548--554. [2] 张望重，陈大任, 朱精敏. 功能材料， 即将发表 [3] 郭常霖，陆昌伟. 物理学报， 1980， 29 (2): 247--256. [4] Li G, Furman E, Haertling G H. J. Am. Ceram. Soc., 1997, 80 (6): 1382--1388. [5] Shout T R, Chen H, Cross L E. Ferroelectrics, 1987, 74: 317--324. [6] Nevrgaonkar R R, Oliver J R, Cory W K. Ferroelectrics, 1994, 160: 265--276. |
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