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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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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(Mg2/3 Nb1/3)O3.研究了一种化合物Bi(Mg2/3 Nb1/3)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(ABO,)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. 相似文献
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采用传统陶瓷制备方法,制备出两种钙钛矿结构无铅新压电陶瓷材料(1-x)(Na1/2Bi1/2)TiO3-x(Na1/2Bi1/2)(Sb1/2Nb1/2)O3和(1-y)(Na1/2Bi1/2)TiO3-yBi(Mg2/3Nb1/3)O3。研究了复合离子与补偿电价取代对(Na1/2Bi1/2)TiO3陶瓷晶体结构和压电性能的影响。)(射线衍射分析表明,在所研究的组成范围内两种陶瓷材料均能够形成纯钙钛矿固溶体.陶瓷材料的介电常数-温度曲线显示两种陶瓷体系具有明显的弛豫铁电体特征.适量的复合离子与补偿电价取代都能提高材料的压电性能,在工=0.8%时,陶瓷的压电常数d33=97pC/N,厚度机电耦合系数kr=0.50,在y=0.7%时d33=94pC/N,y=0.9%时k1=0.46,为所研究组成中的最大值。两种陶瓷体系都具有较大的‰值和较小的kp值,具有较大的各向异性,是一种优良的、适合高频下使用的超声换能材料. 相似文献
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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(ω)为F(ω)=|M| |R| 100|χ|,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,χ为A-位和B-位离子的电负性差。研究发现,F(ω)与BNT基无铅压电陶瓷的压电耦合系数κ33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-χ(BaaSrb)χTiO3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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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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Shujun Zhang Thomas R Shrout Hajime Nagata Yuji Hiruma Tadashi Takenaka 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2007,54(5):910-917
Lead-free piezoelectric ceramics with compositions around the morphotropic phase boundary (MPB) x(Na0.5Bi0.5)TiO3-y(K0.5Bi0.5)TiO3-zBaTiO3 [x + y + z = 1; y:z = 2:1] were synthesized using conventional, solid-state processing. Dielectric maximum temperatures of 280 degrees C and 262 degrees C were found for tetragonal 0.79(Na0.5Bi0.5)TiO3-0.14(K0.5Bi0.5)TiO3-0.07BaTiO3 (BNBK79) and MPB composition 0.88(Na0.5Bi0.5)TiO3-0.08(K0.5Bi0.5)TiO3-0.04BaTiO3 (BNBK88), with depolarization temperatures of 224 degrees C and 162 degrees C, respectively. Piezoelectric coefficients d33 were found to be 135 pC/N and 170 pC/N for BNBK79 and BNBK88, and the piezoelectric d31 was determined to be -37 pC/N and -51 pC/N, demonstrating strong anisotropy. Coercive field values were found to be 37 kV/cm and 29 kV/cm for BNBK79 and BNBK88, respectively. The remanent polarization of BNBK88 (approximately 40 microC/cm2) was larger than that of BNBK79 (approximately 29 microC/cm2). The piezoelectric, electromechanical, and high-field strain behaviors also were studied as a function of temperature and discussed. 相似文献
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以(Na0.5Bi0.5)0.94Ba0.06TiO3为基体,研究了单、双组分掺杂La2O3、Y2O3对BNBT6陶瓷的压电和介电性能及微观结构的影响。XRD分析表明:掺杂La2O3、Y2O3均得到钙钛矿结构。SEM分析表明,分别掺杂0.2%La2O3和0.2%Y2O3使得陶瓷晶粒增大,压电常数提高,双组分掺杂La2O3、Y2O3在掺杂量0.12%La2O3+0.08%Y2O3时,压电常数d33增大到最大值144.6×10-12C/N,介质损耗降低到最小值0.039。 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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(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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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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M Hejazi B Jadidian A Safari 《IEEE transactions on ultrasonics, ferroelectrics, and frequency control》2012,59(8):1840-1847
This paper discusses the fabrication and characterization of a single-element ultrasonic transducer with a lead-free piezoelectric active element. A piezoelectric ceramic with composition of 0.88Bi(0.5)Na(0.5)TiO(3)-0.08Bi(0.5)K(0.5)TiO(3)- 0.04Bi(0.5)Li(0.5)TiO(3) was chosen as the active element of the transducer. This composition exhibited a thickness coupling coefficient (kt) of 0.45, a dielectric constant of 440 (at 1 kHz), and a longitudinal piezoelectric coefficient (d(33)) of 84 pC?N(-1). To make the transducer, the ceramic was sandwiched between an epoxy-tungsten backing layer and a silver epoxy matching layer. An epoxy lens was also incorporated into the transducer?s design to focus the ultrasound beam. The focused transducer with a center frequency of about 23 MHz demonstrated a -6-dB bandwidth of 55% and an insertion loss of -32 dB; the -20-dB pulsed length was measured to be 150 ns. A phantom made of copper wires (30 μm in diameter) was utilized to investigate the imaging capability of the transducer. The results indicated that the fabricated transducer, with a lateral resolution of 260 μm and a relatively high depolarization temperature, could be considered as a candidate for replacement of lead-based ultrasonic transducers. 相似文献
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Gd2O3 (0–0.8 wt.%)-doped 0.82Bi0.5Na0.5TiO3–0.18Bi0.5K0.5TiO3 (BNKT18) lead-free piezoelectric ceramics were synthesized by a conventional solid-state process. The effects of Gd2O3 on the microstructure, the dielectric, ferroelectric and piezoelectric properties were investigated. X-ray diffraction (XRD) data shows that Gd2O3 in an amount of 0.2–0.8 wt.% can diffuse into the lattice of BNKT18 ceramics and form a pure perovskite phase. Scanning electron microscope (SEM) images indicate that the grain size of BNKT18 ceramics decreases with the increase of Gd2O3 content; in addition, all the modified ceramics have a clear grain boundary and a uniformly distributed grain size. At room temperature, the ferroelectric and piezoelectric properties of the BNKT18 ceramics have been improved with the addition of Gd2O3, and the BNKT18 ceramics doped with 0.4 wt.% Gd2O3 have the highest piezoelectric constant (d33 = 137 pC/N), highest relative dielectric constant (εr = 1023) and lower dissipation factor (tan δ = 0.044) at a frequency of 10 kHz. The BNKT18 ceramics doped with 0.2 wt.% Gd2O3 have the highest planar coupling factor (kp = 0.2463). 相似文献