Characterization of Piezoelectric Lead Zirconate Titanate from the Viewpoint of Transducer and Power Generator Properties

概要

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Mechanical, electrical and transducer properties of piezoelectrics are estimated using a newly proposed method. Transducer properties of piezoelectrics, i.e., power generation and energy conversion properties, are useful for application to power microelectromeehanical system (MEMS) devices. Electrical and mechanical properties of piezoelectrics could be estimated from the viewpoint of application to electronic devices using a trial measuring apparatus. The electromechanical coupling constant is estimated to be 0.53 in the case of lead zirconate titanate (PZT) using the same apparatus under short- and open-circuit conditions. The electromechanical coupling constant is calculated from the mechanical properties, i.e., two kinds of Young's modulus. On the other hand, the output peak power of PZT transducers is determined to be approximately 3 μW, which is the product of a 1.8 V voltage and a 1.7 μA current, in the case of 40N input applied load. Since output voltage and current exhibit linear relationships with applied load, the output electrical power is equal to the square of the applied load. This shows that piezoelectrics attached to the sole could realize μW electrical power through the efficient use of total human weight.
社団法人応用物理学会の論文
2002-11-30