Piezoelectric Effect

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When certain crystals are mechanically strained, a voltage is produced with or across from the strain axis, depending upon the crystal type. The effect is reversible; voltage applied will cause strain on the crystal.

The following article abstract shows that multiple and simultaneous resonant modes in PZT piezoelectric material may be controlled by voltage patterns over time, referred to by the author as phrase-sensitive.


Article: Journal of Applied Physics

Piezoelectric resonance of lead zirconate titanate ceramics excited by a stepwise electric field

Li Jin, Xi Yao, and Xiaoyong Wei
Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi’an Jiaotong University, Xi'an 710049, People’s Republic of China

Abstract

Transient current of ferroelectric ceramics has been intensively studied using a stepwise electric field. Abnormal oscillations were observed in the transient current when a stepwise electric field was applied onto modified lead zirconate titanate (PZT) ceramic samples in a very short time (less than 100 ns) in the present study. Compared to the frequency spectrum of those samples, it is found that those frequencies of oscillations correspond to that of piezoelectric resonance. Four samples of PZT ceramics were cut into different dimensions according to the requirement of five different electromechanical coupling modes. Experimental results demonstrate that those five piezoelectric resonance modes of the ferroelectric samples could be excited by a stepwise electric field, and different resonance modes of a sample could be excited simultaneously. The authors also found that whether piezoelectric resonance could be excited depends on the parameters of test circuit.
© 2006 American Institute of Physics

Source: J. Appl. Phys. 99, 014105 (2006); doi:10.1063/1.2158495 (http://jap.aip.org/japiau/v99/i1/p014105_s1)