Positive effects of lateral rarefaction wave on the shock-wave-induced electromechanical coupling response of ferroelectric materials

Refinement design of shock-wave high-pressure loading is needed to suppress the lateral rarefaction wave, which can potentially reduce the pressure and inhibit the occurrence of pressure-induced effects (e.g. phase transition). In this study, based on the numerical simulation of shock dynamics, an ideal one-dimensional stress state in a ferroelectric crystal could be achieved in the lateral rarefaction zone under shock-wave loading. The thermodynamic analysis and experimental tests showed that, at the same loading rate, compared with one-dimensional strain state in the non-lateral rarefaction zone, one-dimensional stress in the lateral rarefaction zone was more conducive to the occurrence of electromechanical coupling effects, such as ferroelectric phase transition and depolarization, thus releasing more charges. It was also indicated that lateral rarefaction protection may not be always necessary in the shock compression experiments.