补偿电价取代对(Bi1/2Na1/2)TiO3无铅压电陶瓷介电与压电性能的影响

Effect of substitution of compensation valence on dielectric and piezoelectric properties of lead-free piezoelectric ceramics of (Bi1/2Na1/2)TiO3

    摘要
  • 摘要: 采用传统陶瓷制备方法,制备出一种钙钛矿结构无铅新压电陶瓷材料(1-x)(Bi1/2Na1/2)TiO3-xBi(Mg2/3Nb1/3)O3。研究了一种化合物Bi(Mg2/3Nb1/3)O3中两种离子Bi3+和(Mg2/3Nb1/3)3+同时进行补偿电价取代对(Bi1/2Na1/2)TiO3陶瓷介电和压电性能的影响。X射线衍射分析表明,所研究的组成均能够形成纯钙钛矿(ABO3)型固溶体。陶瓷材料的介电常数-温度曲线显示该体系材料具有明显的弛豫铁电体特征。适量的取代能提高材料的压电性能,在x=0.7%时压电常数d33=94 pC/N,x=0.9%时厚度机电耦合系数kt=0.46,为所研究组成中的最大值。该体系陶瓷具有较大的kt值和较小的kp值,具有较大的各向异性。

     

    Abstract: A new lead-free piezoelectric ceramics of（1-x）（Bi1/2Na1/2）TiO3-xBi（Mg2/3Nb1/3）O3,were synthesized by conventional solid state reaction method.Effect of substitution of compensation valence of Bi3+ and（Mg2/3Nb1/3）3+ on crystal structure,dielectric and piezoelectric properties of（Bi1/2Na1/2）TiO3 ceramics were investigated.The XRD analysis showed that all compositions can form single perovskite phase.Temperature dependence of dielectric constant εr measurement indicated these compounds were typical relaxor ferroelectric.Addition of small amount of Bi（Mg2/3Nb1/3）O3 improves piezoelectric properties and the optimal piezoelectric properties of d33=94 pC/N and kt=0.46 were obtained at x=0.7 % and x=0.9 %,respectively.The（1-x）（Bi1/2Na1/2）TiO3-xBi（Mg2/3Nb1/3）O3 ceramics have high kt value and low kp value.

     

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