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对三明治复合结构TbxDy1-xFe2-y/Pb(Zr,Ti)O3/TbxDy1-xFe2-y的电容与频率及磁场的函数关系进行了实验和理论研究.实验发现,该复合材料样品的电容随频率的增加而出现多个谐振峰,并且其谐振点随磁场的增加而发生频移.在谐振点附近,观察到样品的阻抗随磁场的增加由容抗性转变为感抗性,从而同时观察到巨大的正磁电容效应和负磁电容效应.由复合材料的弹性力学本构方程出发,对该类样品的电容随频率及磁场的变化进行了理论模拟.结果显示,模拟曲线与实验结果符合得很好.理论表明该磁致伸缩/压电复合材料的磁电容效应源于磁场诱变的铁磁相柔顺系数.
Experimental and theoretical studies have been performed on the capacitance of the sandwich structure TbxDy1-xFe2-y / Pb (Zr, Ti) O3 / TbxDy1-xFe2-y as a function of frequency and magnetic field.The experimental results show that the capacitance of the composite sample varies with the frequency , And the resonant point of the sample shifts with the increase of the magnetic field.At the vicinity of the resonance point, the impedance of the sample is observed to change from capacitive to inductive with the increase of the magnetic field, so as to observe simultaneously Huge positive magnetic capacitance effect and negative magnetic capacitance effect.Starting from the constitutive equation of elastic mechanics of composite material, the theoretical simulation of the capacitance of the samples with frequency and magnetic field is carried out.The results show that the simulation curves are in good agreement with the experimental results The theory shows that the magnetostrictive effect of the magnetostrictive / piezoelectric composite originates from the field-dependent ferromagnetic phase compliance factor.