Bi_(0.5)Na_(0.5)TiO_3-Ba(Al_(0.5)Sb_(0.5))O_3陶瓷的压电、铁电特性及场致应变效应

Piezoelectric and ferroelectric and electric-field induced strain properties in Bi_(0.5)Na_(0.5)TiO_3-Ba(Al_(0.5)Sb_(0.5))O_3 ceramics

用普通陶瓷工艺制备了(1–x)Bi_(0.5)Na_(0.5)Ti O_3-x Ba(Al_(0.5)Sb_(0.5))O_3(x=0.03~0.05)压电陶瓷,研究了Ba(Al_(0.5)Sb_(0.5))O_3含量对Bi_(0.5)Na_(0.5)Ti O_3(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(Al_(0.5)Sb_(0.5))O_3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d_(33)=99 p C/N,最大的应变S_(max)=0.27%,机电耦合系数k_p=20.1%,k_t=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）O3 content 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）O3 increasing. 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.