磁电复合材料的性能研究及器件设计
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摘要
磁电材料是一类新颖的多功能材料,具有许多潜在的应用,不仅具有电、磁特性,而且电、磁之间存在耦合相互作用即磁电效应。基于目前已有的工作基础,本论文构造新的PZT/Terfenol-D磁电叠层复合材料来获得较高的磁电性能,进行了深入的实验研究。
第一：对PZT/Terfenol-D双层结构磁电复合材料进行研究,得出磁电性能随偏置磁场、谐振频率、不同位置磁电压分布等因素的变化规律。经过测试发现它们都具有了较好的磁电性能。
第二：制备了PMNT/Terfenol-D/PMNT三明治结构磁电复合材料,研究其电转换磁效率,实验结果显示这种结构具出了良好的磁电性能,其磁电系数是双层磁电复合样品的2倍多。并得到了该结构复合材料的谐振特征,磁电系数和相位差随频率变化的规律,还运用相关理论对实验结果进行了解释。
第三：基于以上研究基础,对PZT/Terfenol-D三层和双层的对称和非对称结构的电诱导磁效应(EIM)和磁诱导电效应(MIE)谐振特征进行细致地实验研究。经过测试得出了谐振频率附近MIE和EIM响应得到增强,谐振峰随磁场发生移动现象是由Terfenol-D在磁场中的声速变化引起,磁电性能与PZT和Terfenol-D的厚度比有关。又通过对样品中PZT层两种不同的电路连接方式,得出非对称复合样品的弯曲EIM谐振模量比对称复合样品的弯曲EIM谐振模量强的理论依据,为将来设计磁电设备提供有效参考。
第四：运用磁电复合材料对磁电原型器件进行了探索。将Rosen压电变压器和Terfenol-D合金复合制备成磁电原型器件,详细讨论了随着Terfenol-D厚度的减小,电诱导磁系数随Rosen压电变压器上位置移动的变化规律,发现此结构的磁电系数得到了很大提高,此结构的磁电性能有望得到进一步增强,如优化复合材料结构的参数。
Magnetoelectric materials are a class of novel multi-functional materials, which have many potential applications. They not only have ferroelectric and magnetic properties, but also the magnetoelectric effect produced from coupling interaction between electric and magnetic orders. Based on our previous researches, we performed deep experimental investigations on a kind of new PZT/Terfenol-D composite consisting of piezoelectric ceramics and magnetostrictive alloy.
Firstly, we researched the double layer PZT/Terfenol-D composite material. The magnetoelectric effect is various with bias magnetic fields and frequency. We found they have relative fine magnetoelectric properties.
Secondly, we prepared a sort of structure of magnetoelectric composites with PMNT/Terfenol-D/PMNT sandwiched structure and studied the electric-field-induced magnetization. We found that the resonance of composite, the magnetoelectric coefficient and the phase shift vary with the frequency. The magnetoelectric coefficient of the sandwiched structure reached two times more than that of the double layer composite.
Thirdly, we researched the symmetrical and asymmetrical structure for the triple layer and double layer of PZT/Terfenol-D magnetoelectric materials. We found the magnetic-field-induced electric polarization (MIE) and the electric-field-induced magnetization (EIM) were strengthened near the resonance frequency. The resonant peak shifts with the bias magnetic field, which depends on sonic the variety of Tefenol-D in the magnetic field. Through the two different electrical circuit connections, we found the magnetoelectric property is relative to the thickness ratio of PZT and Terfenol-D.
Finally, we explored the magnetoelectric models by using the magnetoelectric composite materials. And we made a magnetoelectric device by using a Rosen-type piezoelectric transform and Terfenol-D alloy. We discussed about the variation of EIM when Rosen piezoelectric transform changes. In addition, we got that this magnetoelectric coefficient increased a lot, although the magnetoelectric properties of this structure still have to be further increase, such as by optimizing the parameter of this composite material structure.
第一：对PZT/Terfenol-D双层结构磁电复合材料进行研究,得出磁电性能随偏置磁场、谐振频率、不同位置磁电压分布等因素的变化规律。经过测试发现它们都具有了较好的磁电性能。
第二：制备了PMNT/Terfenol-D/PMNT三明治结构磁电复合材料,研究其电转换磁效率,实验结果显示这种结构具出了良好的磁电性能,其磁电系数是双层磁电复合样品的2倍多。并得到了该结构复合材料的谐振特征,磁电系数和相位差随频率变化的规律,还运用相关理论对实验结果进行了解释。
第三：基于以上研究基础,对PZT/Terfenol-D三层和双层的对称和非对称结构的电诱导磁效应(EIM)和磁诱导电效应(MIE)谐振特征进行细致地实验研究。经过测试得出了谐振频率附近MIE和EIM响应得到增强,谐振峰随磁场发生移动现象是由Terfenol-D在磁场中的声速变化引起,磁电性能与PZT和Terfenol-D的厚度比有关。又通过对样品中PZT层两种不同的电路连接方式,得出非对称复合样品的弯曲EIM谐振模量比对称复合样品的弯曲EIM谐振模量强的理论依据,为将来设计磁电设备提供有效参考。
第四：运用磁电复合材料对磁电原型器件进行了探索。将Rosen压电变压器和Terfenol-D合金复合制备成磁电原型器件,详细讨论了随着Terfenol-D厚度的减小,电诱导磁系数随Rosen压电变压器上位置移动的变化规律,发现此结构的磁电系数得到了很大提高,此结构的磁电性能有望得到进一步增强,如优化复合材料结构的参数。
Magnetoelectric materials are a class of novel multi-functional materials, which have many potential applications. They not only have ferroelectric and magnetic properties, but also the magnetoelectric effect produced from coupling interaction between electric and magnetic orders. Based on our previous researches, we performed deep experimental investigations on a kind of new PZT/Terfenol-D composite consisting of piezoelectric ceramics and magnetostrictive alloy.
Firstly, we researched the double layer PZT/Terfenol-D composite material. The magnetoelectric effect is various with bias magnetic fields and frequency. We found they have relative fine magnetoelectric properties.
Secondly, we prepared a sort of structure of magnetoelectric composites with PMNT/Terfenol-D/PMNT sandwiched structure and studied the electric-field-induced magnetization. We found that the resonance of composite, the magnetoelectric coefficient and the phase shift vary with the frequency. The magnetoelectric coefficient of the sandwiched structure reached two times more than that of the double layer composite.
Thirdly, we researched the symmetrical and asymmetrical structure for the triple layer and double layer of PZT/Terfenol-D magnetoelectric materials. We found the magnetic-field-induced electric polarization (MIE) and the electric-field-induced magnetization (EIM) were strengthened near the resonance frequency. The resonant peak shifts with the bias magnetic field, which depends on sonic the variety of Tefenol-D in the magnetic field. Through the two different electrical circuit connections, we found the magnetoelectric property is relative to the thickness ratio of PZT and Terfenol-D.
Finally, we explored the magnetoelectric models by using the magnetoelectric composite materials. And we made a magnetoelectric device by using a Rosen-type piezoelectric transform and Terfenol-D alloy. We discussed about the variation of EIM when Rosen piezoelectric transform changes. In addition, we got that this magnetoelectric coefficient increased a lot, although the magnetoelectric properties of this structure still have to be further increase, such as by optimizing the parameter of this composite material structure.
引文
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