LaFeO_(3)固溶取代对BCZT铁电陶瓷电致伸缩性能影响研究

Effect of LaFeO(3) Solution Substitution on Electrostrictive Properties of BCZT Ferroelectric Ceramics

以(Ba0.856Ca0.144)(Ti0.896Zr0.104)O_(3)(BCZT)为载体,通过LaFeO3固溶取代来对BCZT的相结构和弛豫程度进行调控。系统地研究了组成变化对微观结构、介电、压电、铁电和电致伸缩特性的影响。结果显示在(Ba0.856Ca0.144-xLax)(Ti0.896-xFexZr0.104)O3陶瓷中,随着LaFeO_(3)含量的增加,相结构逐渐由铁电四方相转变为立方相,介电常数随着Tm的降低逐渐增加,弛豫程度逐渐增大。在x=0.0275时居里温度Tm降至室温以下,应变曲线由正常的蝴蝶形双极应变逐渐转变为无滞后类线性的电致伸缩应变,同时电致伸缩系数Q33逐渐下降。在x=0.0275时获得了无滞后的电致伸缩应变(S=0.026%,Q33=0.03 m4/C2),显示出BCZT在高精度陶瓷驱动器应用中的良好潜力。

The composition of(Ba0.856Ca0.144)(Ti0.96Zr0.104)O_(3)(BCZT)was chosen as the matrix,the phase structure and relaxor of BCZT were tuned by LaFeO3 substitution.The relation with composition and the microstructure,dielectric,piezoelectric,ferroelectric and electrostrictive properties were systematically studied.In(Ba0.856Ca0.144-xLax)(Ti0.896-xFexZr0.104)O_(3)ceramics,the phase structure gradually changed from tetragonal phase to cubic phase,with the LaFeO3 content increasing.Meanwhile,the dielectric constant gradually increased with Tm decreasing,and the degree of relaxor gradually increased.When x=0.0275,Tm was below room temperature,and the strain gradually transforms from the normal butterfly bipolar strain to the linear electrostrictive strain without hysteresis.It was found that with the increase of LaFeO3 content,the electrostriction coefficient Q33 decreased gradually.At x=0.0275,the electrostrictive strain value is 0.026%,Q33=0.03 m4/C2,suggesting the great potential of these materials for the application of high-precision ceramic actuators.