以传统电子陶瓷工艺制备了(K0.5Na0.5)1-2xSrx(Nb0.94 Sb0.06)O3 无铅压电陶瓷,研究了适量锶、锑取代对陶瓷结构及电性能的影响. 结果表明,少量的锶、锑取代没有改变(K0.5Na0.5) NbO3陶瓷的相结构,仍为单相正交结构的钙钛矿型铁电体;适量的锶取代使得晶粒大小均匀一致,提高了陶瓷的致密度;锶、锑取代降低了陶瓷的居里温度,但对正交四方相变温度的影响不大,且在0~200℃的温度范围,介电常数几乎不依赖频率的变化而变化;在x=0.008处,得到较好综合性能的陶瓷材料:d33=155pC/N,kp=0.361,Qm=120,Np=2862,Pr=23μC/cm2,Ec=1.4kV/mm,ρ=4.411g/cm3.
Leadfree piezoelectric ceramics (K0.5Na0.5)1-2xSrx(Nb0.94 Sb0.06)O3 (abbreviated as KNSNS1000x) were synthesized by the conventional ceramic sintering technique. The structure and electrical properties of KNSNS1000x ceramics were investigated. The results of XRD indicate that KNSNS1000x ceramics have an orthorhombic structure. The proper content of Sr substitute increases the density of ceramics which reaches the maximum value of 4.411g/cm3 at x=0.008. With the increase of the amount of Sr, the Tc decreases and the temperature of orthorhombictetragonal phase transition (To-t) is almost a constant.In the temperature range from 0℃ to 200℃, dielectric constant of KNSNS1000x ceramics is independent of frequency. The KNSNS8 ceramics obtains the optimum piezoelectric properties: d33=155pC/N, kp=0.361,Qm=120,Np=2862,Pr=23μC/cm2,Ec=1.4kV/mm,ρ=4.411g/cm3.
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