Structural phase transition and electrical properties of Sr2+ substituted porous PMN‐PZT ceramics

In this study, Sr2+ modified porous PMN-PZT ceramics with one-dimensional pore channels were produced by the ionotropic gelation process of alginate/PMN-PZT suspensions. The ion-exchange method was employed during the fabrication procedure to adjust the content of SrO addition. With the SrO addition increasing from 1.653 wt.% to 2.957 wt.%, the structural phase of porous PMN-PZT ceramics transformed from rhombohedral (R) to tetragonal (T) perovskite phase. Accordingly, the electromechanical coupling coefficient (k(t)) value of porous PMN-PZT ceramics decreased from 64.7% to 58.7%, while the hydrostatic figure of merit (HFOM) value increased from 1510 to 5547x10(-15)m(2)/N, and acoustic impedance Z value ranged from 4.59 to 7.55 MRayls, which helped for applications in underwater transducers or hydrophones.