Investigation of enhanced performance in BF-xPT-0.05BZ ternary ceramics for high temperature applications

Abstract

Abstract (0.95-x)BiFeO3-xPbTiO3-0.05BaZrO3 (BF-xPT-0.05BZ) ternary ceramics were synthesized by the solid-state reaction method, which present a perovskite structure without detectable second phase. BF-0.32PT-0.05BZ ceramics display the dominant rhombohedral structure with a small amount of tetragonal phase, revealing the characteristics of morphotropic phase boundary (MPB). The well-densified ceramics possess the average grain size of 8–15\u202fμm with different PT contents. The ferroelectric-paraelectric phase transition of BF-xPT-0.05BZ ceramics shows the characteristic of the first-order transition, which occurs at around 550\u202f°C. It is noticeable that BF-0.32PT-0.05BZ ceramics exhibit the giant remnant polarization of 60\u202fμC/cm2 under the field of 175\u202fkV/cm. Moreover, BF-0.32PT-0.05BZ ceramics show the highest piezoelectric constant d33 of 105\u202fpC/N and Qm of 501. The depolarization temperatures of BF-xPT-0.05BZ ceramics are much close to their Curie temperature TC, proving the extensive prospect for high temperature piezoelectric applications.