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(NaBi)0.5TiO3基无铅压电陶瓷研究进展 总被引:1,自引:0,他引:1
综述了钙钛矿结构(NaBi)0.5TiO3基无铅压电陶瓷的研究现状.评价了(NaBi)0.5TiO3基无铅压电陶瓷的三种改性方法:氧化物掺杂改性、固溶体改性和工艺改性.研究表明:几种方法复合改性效果更佳,无铅压电织构陶瓷压电性能远远优于传统工艺制备的无铅压电陶瓷. 相似文献
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(Bi0.5Na0.5)1-x(BaaSrb)x TiO3无铅压电陶瓷体系的设计、制备与性能 总被引:1,自引:0,他引:1
综合考虑(Bi0.5Na0.5) TiO3(BNT)基无铅压电陶瓷的A-位、B-位原子的原子量差、离子半径差和电负性差,提出了一种BNT基无铅压电陶瓷的设计方法.依据BNT基无铅压电陶瓷所报道的相关数据,定义了ABO3型压电陶瓷的综合因子F(w)为 F(w)= M+R+100X,式中,M为A-位和B-位离子的质量差,R为A-位和B-位离子的离子半径差,X为A-位和B-位离子的电负性差.研究发现,F(w)与BNT基无铅压电陶瓷的压电耦合系数k33和kp, 以及压电常数d33有非常紧密的关系.根据该方法设计了(Bi0.5Na0.5)1-x(BaaSrb)xTiO3无铅压电陶瓷新体系,并申报了国家发明专利.研究结果表明,该体系压电陶瓷具有很好的工艺特性和压电响应,高的压电常数,其机电耦合系数kp为0.311,压电常数d33高达146pC/N,居里温度Tc为310℃,是一种很有实际应用前景的新型压电陶瓷材料体系. 相似文献
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(Na,K)0.5Bi0.5TiO3无铅压电陶瓷的结构与性能研究 总被引:6,自引:0,他引:6
研究了K0.5Bi0.5TiO3(KBT)含量对Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3(BNKT)无铅压电陶瓷的显微组织结构及压电性能的影响规律,结果表明随KBT含量增加,BNKT无铅压电陶瓷的晶胞参数增大,密度减小,晶粒尺寸减小,居里温度从326℃升高到360℃,压电常数、介电常数和介电损耗增加,机械品质因数下降;KBT含量为0.15mol的(Na0.85K0.15)0.5Bi0.5TiO3无铅压电陶瓷位于准同型相界处,具有较佳的压电性能. 相似文献
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随着经济的发展和人们环保意识的增强,无铅压电陶瓷的研究和开发越来越引起人们的重视.但此类材料的压电性能相对于铅基压电陶瓷来说还存在较大差距,严重制约着它的实际应用.纳米技术的出现和发展为无铅压电陶瓷性能全面达到或超过铅基压电陶瓷提供了很好的机遇和平台.综述了近年来无铅压电陶瓷纳米粉体的合成方法,比较了纳米粉体和普通原料制备的无铅压电陶瓷的性能,展望了无铅压电陶瓷未来的发展和应用前景.通过调控反应参数,得到不同尺寸和形状的纳米粉体,实现无铅压电陶瓷纳米粉体的尺寸和形状均匀且可控,无铅压电陶瓷的性能必将大幅度地提高. 相似文献
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BNT-BT和BNT-BKT基无铅压电陶瓷研究进展 总被引:6,自引:1,他引:5
综述了Bi0.5Na0.5TiO3-BaTiO3系和Bi0.5Na0.5TiO3-Bi0.5K0.5TiO3系无铅压电陶瓷的最新研究进展.总结了各种添加剂对这两种无铅压电陶瓷体系压电性能的影响机理和规律,介绍了当前以各种工艺对其微观结构和压电性能进行改进的研究成果,并展望了这两种无铅压电陶瓷体系的发展趋势. 相似文献
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LiSbO3 doped and undoped 0.995 K0.5Na0.5NbO3-0.005BiFeO3 piezoelectric ceramics with high properties have been fabricated in air by the conventional ceramic processing. By adding LiSbO3 to K0.5Na0.5NbO3-BiFeO3 ceramics, the dielectric and piezoelectric properties evidently increase. The doped ceramics exhibit good electrical properties. The enhanced piezoelectric properties of the ceramics should be attributed to optimum LiSbO3 substitution and better microstructure with high density. Results show that LiSbO3 doped K0.5Na0.5NbO3-BiFeO3 lead-free piezoelectric ceramics are a promising lead-free piezoelectric material for applications in different devices. 相似文献
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RTGG法制备(Na_(0.84)K_(0.16))_(0.5)Bi_(0.5)TiO_3无铅压电织构陶瓷的研究 总被引:1,自引:0,他引:1
以NaCl-KCl熔盐法制备出了片状的Bi4Ti3O12微晶模板,选用此模板分别采用干法和湿法流延工艺结合RTGG技术制备了(Na0.84K0.16)0.5Bi0.5TiO3无铅压电织构陶瓷。研究了不同工艺条件下获得的织构陶瓷烧结行为、织构度、显微组织结构和电性能的变化规律。结果表明,(Na0.84K0.16)0.5Bi0.5TiO3织构陶瓷的烧成温度范围只有10~20℃,其介电性能、压电性能呈现明显的各向异性,沿垂直于流延方向织构陶瓷的各种电学性能均明显优于平行于流延方向的电学性能,两种流延方法在1150℃烧结所得的(Na0.84K0.16)0.5Bi0.5TiO3织构陶瓷在显微组织结构和电性能方面均表现出最强的各向异性,该织构陶瓷的压电常数d33=134pC/N。 相似文献
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钛酸铋钠基无铅压电陶瓷研究近期进展 总被引:2,自引:0,他引:2
钛酸铋钠(分子式是Bi0.5Na0.5TiO3,简写为BNT)基无铅压电陶瓷性能优良,但与铅基陶瓷相比还有相当的差距,其性能有待进一步提高.从BNT基陶瓷改性、陶瓷新体系以及陶瓷制备技术等多方面,分析了提高BNT基陶瓷性能的原理、途径和方法,指出了发明陶瓷新体系的有关思路,讨论了陶瓷制备技术与陶瓷性能的关系.同时,列举了近期在BNT基陶瓷性能改善研究中的若干新进展和新结果、性能良好的BNT基陶瓷新体系及制备工艺和制备新技术对陶瓷性能的影响,并对今后的相关研究进行了展望. 相似文献
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Lead-free piezoelectric ceramics (Na0.5K0.5-xLix)NbO3 (x=0.057-0.066) were synthesized by an ordinary sin-tering technique. Substituting Li for K can lead to structural distortion, which improves the Curie temperature (To) greatly. By adding appropriate LiNbO3 content, piezoelectric constant d33 values reach 202-212 pC/N. Electromechanical coefficients of the planar mode reach 44.4%-46.8%. The dielectric loss is below 2.6%, which is much lower than reported (about 50%). The To of (Na0.5K0.5-xLix)NbO3 (x=0.057-0.066) is in the range of 490-510℃, at least 70℃ higher than that of pure (Na0.5K0.5)NbO3 ceramics. The results show that (Na0.5K0.5-xLix)NbO3 ceramic is a kind of good lead-free high-temperature piezoelectric material. 相似文献
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Investigation on the composition design and properties study of perovskite lead-free piezoelectric ceramics 总被引:1,自引:0,他引:1
Lead-free piezoelectric ceramics can be divided into perovskite, tungsten bronze, and bismuth layered structure ceramics.
In recent years, the authors’ group concentrates the researches on the composition design and the properties study of perovskite
lead-free piezoelectric ceramics, especially on the (Bi1/2Na1/2)TiO3 (BNT)- and K1/2Na1/2NbO3 (KNN)-based ceramics. All the ceramics were prepared by the conventional ceramic technique. In this paper, the main results
obtained are reviewed with emphasis on KNN-based ceramics, including (1) the design on new BNT-based ceramics based on the
multiple complex in the A-site of ABO3 compounds; (2) the design of KNN-based ceramics focused on the effects of Ag ion substitution, K/Na ratio, and LiSbO3 on KNN-based ceramics; (3) the effects of doping on the properties of BNT- and KNN-based ceramics; and (4) the temperature
stability of BNT- and KNN-based ceramics. And some prospects to be resolved in coming years from the viewpoint of the applications
of the perovskite lead-free piezoelectric ceramics are also pointed out. 相似文献
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(Bi0.5Na0.5)TiO3系无铅压电陶瓷研究现状与展望 总被引:2,自引:0,他引:2
BNT陶瓷由于具有良好的压电性、高居里温度和烧结过程中无毒、易控制性等优点而倍受青睐.本文介绍了无铅压电陶瓷的研究概况、相变过程及其基本性质、制备工艺,根据已有的研究经验着重对BNT陶瓷掺杂改性进行了探讨,并展望了它的发展前景. 相似文献
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Jing LiuJiliang Zhu Xuhai LiMingsong Wang Xiaohong ZhuJianguo Zhu Dingquan Xiao 《Materials Letters》2011,65(6):948-950
CuO-doped 0.98K0.5Na0.5NbO3-0.02BiScO3 (0.98KNN-0.02BS-xCu) lead-free piezoelectric ceramics have been fabricated by ordinary sintering technique. The effects of CuO doping on the dielectric, piezoelectric, and ferroelectric properties of the ceramics were mainly investigated. X-ray diffraction reveals that the samples at doping levels of x ≤ 0.01 possess a pure tetragonal perovskite structure. The specimen doped with 1 mol% CuO exhibits enhanced electrical properties (d33 ~ 207 pC/N, kp ~ 0.421, and kt = 0.424) and relatively high mechanical quality factor (Qm = 288). These results indicate that the 0.98KNN-0.02BS-0.01Cu ceramic is a promising candidate for lead-free piezoelectric ceramics for applications such as piezoelectric actuators, harmonic oscillator and so on. 相似文献