scholarly journals Анизотропия магнитоэлектрических свойств объемных композитов феррит-пьезоэлектрик

2019 ◽  
Vol 89 (5) ◽  
pp. 675
Author(s):  
В.М. Лалетин ◽  
Д.А. Филиппов ◽  
К.И. Янушкевич

AbstractThe anisotropy of magnetoelectric properties of lead zirconate–titanate and nickel ferrite based bulk composites has been experimentally studied. It has been shown that a ratio of longitudinal to transverse magnetoelectric coefficients is affected by the piezoelectric constant of a composite. The mechanism that explains the obtained dependences has been suggested; the mechanism is based on the assumption that the anisotropy of magnetic properties is caused by the deformation occurring at electric polarization of a sample.

Author(s):  
Qing Guo ◽  
G. Z. Cao ◽  
I. Y. Shen

Lead Zirconate Titanate Oxide (PbZrxTi1−xO3 or PZT) is a piezoelectric material widely used as sensors and actuators. For microactuators, PZT often appears in the form of thin films to maintain proper aspect ratios. This paper is to present a simple and low-cost method to measure piezoelectric constant d33 of PZT thin films, which is a major challenge encountered in the actuator development. We use an impact hammer with a sharp tip to generate an impulsive force that acts on the PZT film. The impulsive force and the responding voltage are then measured to calculate the piezoelectric constant d33. The impulsive force has large enough amplitude so that a good signal-to-noise ratio can be maintained. Furthermore, the impulsive force has extremely short duration, so the discharge effect (i.e., the time constant effect) of the PZT circuit can be ignored. Preliminary testing on bulk PZT through this new method leads to two conclusions. Firstly, boundary conditions of the specimen are critical. In particular, the specimen must be securely fastened. Since the impulsive load only acts on a tiny area, loose boundary conditions can introduce spurious results from other piezoelectric constant d31. Secondly, size of the specimen is critical. Specimen of smaller size leads to more accurate measurements of the piezoelectric constant d33.


2011 ◽  
Vol 94 (11) ◽  
pp. 3941-3947 ◽  
Author(s):  
Smitha Puthucheri ◽  
Prashant K. Pandey ◽  
Namdeo S. Gajbhiye ◽  
Arti Gupta ◽  
Anupinder Singh ◽  
...  

2004 ◽  
Vol 95 (12) ◽  
pp. 8069-8073 ◽  
Author(s):  
M. Zeng ◽  
J. G. Wan ◽  
Y. Wang ◽  
H. Yu ◽  
J.-M. Liu ◽  
...  

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