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无机材料学报

无机材料学报

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(K0.5Na0.5)1-2xSrx(Nb0.94 Sb0.06)O3无铅压电陶瓷结构及性能研究

范桂芬1,2， 吕文中1， 饶源源1   

  1. 华中科技大学1. 电子科学与技术系; 2. 材料科学与工程学院，武汉 430074
  • 收稿日期:2008-07-21 修回日期:2008-09-18 出版日期:2009-05-20 网络出版日期:2009-05-20

Structure and Properties of (K0.5Na0.5)1-2xSrx(Nb0.94 Sb0.06)O3 Lead-free Piezoelectric Ceramics

FAN Gui-Fen1,2, LUWen-Zhong1, RAO Yuan-Yuan1   

  1. 1.Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, China; 2.College of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
  • Received:2008-07-21 Revised:2008-09-18 Published:2009-05-20 Online:2009-05-20

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1545

被引次数

2

摘要： 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.

关键词: 无铅压电陶瓷, 铌酸钾钠, 压电性能

Abstract: Leadfree 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 orthorhombictetragonal 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.

Key words: leadfree piezoelectric ceramics, sodium potassium niobate, piezoelectric properties

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