Bi0.5Na0.5TiO3-Ba(Al0.5Sb0.5)O3陶瓷的压电、铁电特性及场致应变效应

摘要

用普通陶瓷工艺制备了(1–x)Bi0.5Na0.5TiO3-xBa(Al0.5Sb0.5)O3(x=0.03~0.05)压电陶瓷,研究了Ba(Al0.5Sb0.5)O3含量对Bi0.5Na0.5TiO3(BNT)压电陶瓷的介电、压电、铁电和场致应变效应的影响.研究表明,随着第二组元Ba(Al0.5Sb0.5)O3含量的增加,该陶瓷经历了从极性态的铁电相向非极性态的非铁电相的转变.在x=0.035组分处,多相共存导致样品具有最大的压电常数d33=99 pC/N,最大的应变Smax=0.27%,机电耦合系数kp=20.1%, kt=30.4%,等效压电常数d*33=386 pm/V.%The (1–x)Bi0.5Na0.5TiO3-xBa(Al0.5Sb0.5)O3(x=0.03–0.05) piezoelectric ceramics were prepared by conventional ceramic technique. The effects of Ba(Al0.5Sb0.5)O3content on the dielectric, piezoelectric and ferroelectric properties, and electric-field induced strain of Bi0.5Na0.5TiO3(BNT) ceramics were investigated. The results indicate that there exists a phase transition from polar ferroelectric phase to non-polar non-ferroelectric phase with the content of second member Ba(Al0.5Sb0.5)O3increasing. Due to the multiphase coexistence, the composition with x=0.035 exhibits the optimal properties: d33=99 pC/N, Smax=0.27%, kp=20.1%, kt=30.4%, d*33=386 pm/V.