Electrical properties of PZT under high-pressure stress pulse: Effects of loading frequency and circuit load

Ruizhi Wang,Chuang Chen,Mengzhou Chang,Enling Tang,Kai Guo,Liping He,Yafei Han,Guolai Yang

doi:10.1016/j.ceramint.2021.10.023

Abstract

The research on the discharge characteristics of PZT under conventional applications has made good progress. In theory, the piezoelectric equation can be used to describe the relationship between stress and electrical output. However, existing studies have shown that the relationship becomes nonlinear under high-pressure stress pulses. To study the effect of the loading frequency and the circuit load on the electrical output performance of PZT under high-pressure stress pulse, the experiments were carried out based on the split Hopkinson pressure bar and a dynamic & static universal test machine. The effects of different circuits on the output voltage under different frequency high-pressure stress pulses are analyzed. Both theory and experiments prove that the critical open-circuit measurement resistance ( R critial ) of PZT decreases with the stress frequency. The output voltage is positively correlated with the load resistance when that is less than R critial . It is confirmed by loading different circuits (diodes are added in different positions) that reverse positive charge appears at the negative pole of the material during the stress unloading stage. PZT has the maximum dischargeable strain ε E M under the high-pressure stress pulses, and it no longer generates induced charges when the strain is greater than ε E M . When constant strain rate loading makes PZT completely release energy, its open-circuit output voltage is proportional to the strain rate.

Highlights

When ferroelectric materials have an asymmetric phase structure below the Curie temperature, they have spontaneous polarization
Tang et al [22] studied the electrical output performance of PZT-5H under different stress pulse frequencies, and the results showed that the output voltage duration of PZT was proportional to the action time of the loading wave
When the load resistance is 1MΩ, the output voltage of PZT is shown in Fig.3 (b)

Summary

Introduction

When ferroelectric materials have an asymmetric phase structure below the Curie temperature, they have spontaneous polarization. PZT is widely used in various sensors, actuators and pulse power supply due to its good electromechanical coupling characteristics. In these applications, the electric energy is stored in PZT during the initial polarization process and released to the electric load by external stress loading. Based on the special force-electric response relationship of piezoelectric ceramics, it is usually subjected to stress pulses during the application, such as high-frequency resonance excitation, vibration and shock. The electrical output properties of PZT under high-pressure stress pulses are used to realize the unique functions of devices, such as pulse igniter, explosive transducer and piezoelectric power supply [17,18,19]

Methods

Results

Conclusion