Asymmetric 90° domain switching in rainbow actuators
Asymmetric 90° domain switching in rainbow actuators
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DOI：
10.1080/00150199808229911
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发表时间：
1998-01-01
期刊：
影响因子：
0.8
通讯作者：
Dausch, DE
中科院分区：
文献类型：
--
作者：
Dausch, DE
研究了彩虹致动器在正负电场作用下的磁畴转换特性的不对称性，并与块体陶瓷材料更对称的特性进行了比较。在彩虹中，机电位移和极化滞后环是不对称的。在+25千伏/厘米极化的彩虹中，随着电场的增加，峰间位移从88增加到450微米，从+/-5增加到+/-24千伏/厘米。极化电压为-25KV/cm的彩虹在13KV/cm(接近矫顽场)时的局部最小位移为95µm，表明位移有效斜率随场环的变化。此外，彩虹具有较低的+E-C(矫顽场)和较高的+P-R(剩余极化)。通过对这些材料的四方峰分裂的X射线衍射分析发现，彩虹在正电场作用下比在负电场作用下表现出更强的a-磁畴向c-磁畴取向的90度重定向。块体陶瓷的性能在正负电场下都是一致的。讨论了一种90度磁区转换的机制。
Asymmetry in the domain switching properties of Rainbow actuators with respect to positive and negative electric field was investigated and compared with the more symmetric properties of bulk ceramic materials. The electromechanical displacement and polarization hysteresis loops were found to be asymmetric in Rainbows. Peak-to-peak displacements in Rainbows poled at +25 kV/cm increased steadily from 88 to 450 mu m with increasing fields of +/-5 to +/-24 kV/cm. Rainbows poled at -25 kV/cm possessed a local minimum in displacement of 95 mu m at 13 kV/cm (near the coercive field) indicating a change in effective slope of the displacement versus field loop. Additionally, Rainbows possessed lower +E-C (coercive field) and higher +P-R (remanent polarization). It was found through X-ray diffraction of the tetragonal peak splitting in these materials that Rainbows exhibited enhanced 90 degrees reorientation of a-domains to c-domain alignment with positive applied electric field than with negative field. Bulk ceramic properties were consistent for both positive and negative applied fields. A mechanism for 90 degrees domain switching is discussed.