共查询到17条相似文献,搜索用时 250 毫秒
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采用固相烧结方法制备了钨铜酸钡(Ba(Cu1/2W1/2)O3)掺杂的PZT压电陶瓷,并进行了XRD分析,结果表明,不同掺杂量下材料的结构均为钙钛矿结构,当掺杂量较多时材料的晶格出现畸变。研究了改性剂Ba(Cu1/2W1/2)O3的掺加量x对材料的介电性能的影响和测量频率f与材料的介电性能的关系,结果表明随着钨铜酸钡掺杂量的增大,材料的居里温度逐渐下降,材料的介电温度峰形逐渐变宽,出现弥散现象;对介电-频率曲线的分析表明,材料的介电-频率特性与多种机制有关。 相似文献
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利用铌铁矿预产物合成法,研究不同温度烧结下Li2CO3掺杂对0.2 PMN-0.8PZT压电陶瓷(简称PLC)的相结构和电性能的影响。X射线衍射(XRD)和扫描电镜(SEM)的分析结果表明,掺杂LiCO3的0.2PMN-0.8PZT压电陶瓷经不同温度煅烧后,所有陶瓷样品的相组成均为纯钙钛矿相,并随着烧结温度的升高,PLC的相结构有由四方相向菱方相转变的趋势。通过0.2PMN-0.8PZT压电陶瓷掺杂LiCO3煅烧后的微观形貌、介电常数、压电性能、铁电性能的分析,发现经1200℃烧结的样品的介电和压电性能最佳:介电常数(εr)为38512,室温压电常数(d33)为300 pC/N,剩余极化强度(Pr)为31.3 C/cm2,矫顽电场(Ec)为7.5 kV/cm。 相似文献
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压电报警器是采用压电陶瓷片作为核心的装置。它具有体积小而发生效果好的特点,因而得到广泛的应用。但是现存的报警器的声压级达不到实际的需求水平,这是因为压电陶瓷材料的性能限制。笔者采用传统的固相法制备PZT二元系压电陶瓷。研究了掺杂不同含量为0.10%,0.15%,0.20%,0.25%,0.30%和0.35%的MnO2和CeO2对PZT压电陶瓷的结构,介电性能,压电性能和介电损耗的影响。并对其微观组织进行了研究。当锰的掺杂量为0.15%时,压电陶瓷的性能得到最佳的优化:tgδ=0.009 5;kp=0.634pC/N;d33=611;ε=2 523。铈的掺杂使陶瓷的烧结温度升高,当铈的掺杂量为0.15%时,压电陶瓷的性能也得到了最佳的优化:tgδ=0.017;kp=0.623;d33=563pC/N;ε=3 310。综上所述,在原配方材料的基础上压电常数和机电耦合系数都有所增加。这对压电报警器的声压的提高、体积的减小有着重要的意义。 相似文献
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采用传统电子陶瓷的制备方法制备了(1-2x)PbNb2O6-xSrTiO3-xTiO2(x=0.005~0.025)高Curie温度(θc)压电陶瓷.X射线衍射分析表明:所有样品在1 250℃保温2h烧结均形成铁电性的斜方钨青铜型结构(tungsteu bronze structure,TB).相对介电常数-温度(εr-θ)曲线表明:该体系具有高的θc(500~560℃).测试了不同掺杂量对陶瓷介电和压电性能的影响,发现材料的θc、压电常数(d33)和机电耦合系数(κp)随着x值的增加先增加后降低.当x=0.02时,陶瓷的d33达到最大值,为83pC/N,θc为550℃,κp达33.4%,材料的介电常数Εθ33/ε0为217,为组成的最优配方. 相似文献
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本文采用传统的固相法制备PZT二元系压电陶瓷。研究了掺杂不同含量为0.1%,0.15%,0.2%,0.25%,0.3%和0.35%的MnO_2和CeO_2对PZT压电陶瓷的结构、介电性能、压电性能和介电损耗的影响。并对其微观组织进行了研究。当锰的掺杂量为0.15%时,压电陶瓷的性能得到最佳的优化:tgδ=0.0095;kp=0.634p C/N;d33=611;ε=2523。铈的掺杂使陶瓷的烧结温度升高,当铈的掺杂量为0.15%时,压电陶瓷的性能也得到了最佳的优化:tgδ=0.017;kp=0.623;d33=563p C/N,ε=3310。在原配方材料的基础上压电常数和机电耦合系数都有所增加。这对压电报警器的声压的提高、体积的减小有着重要的意义。 相似文献
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《陶瓷》2017,(4)
笔者采用传统的固相法制备PZT二元系压电陶瓷。研究了掺杂不同含量为0.1%,0.15%,0.2%,0.25%,0.3%和0.35%的MnO_2和CeO_2对PZT压电陶瓷的结构、介电性能、压电性能和介电损耗的影响。并对其微观组织进行了研究。当锰的掺杂量为0.15%时,压电陶瓷的性能得到最佳的优化:tgδ=0.009 5;kp=0.634;d_(33)=611pC/N;ε=2 523。铈的掺杂使陶瓷的烧结温度升高,当铈的掺杂量为0.15%时,压电陶瓷的性能也得到了最佳的优化:tgδ=0.017;kp=0.623;d_(33)=563pC/N,ε=3 310。在原配方材料的基础上压电常数和机电耦合系数都有所增加。这对压电报警器的声压的提高、体积的减小有着重要的意义。 相似文献
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以导电碳黑(CB)为导电相、压电陶瓷(PZT)为压电相、聚氨酯(PU)为基体制备了一系列的压电阻尼复合材料(PU/CB/PZT)。研究了CB、PZT对所制备材料的耐击穿性能的影响,探讨了材料的压电性能和阻尼性能随PZT含量以及极化时间的变化规律。结果表明,PU/CB/PZT压电阻尼复合材料的压电常数随PZT含量和极化时间增加而增加,当极化场强选为5 kV/mm、极化时间30 min、PU/CB/PZT质量份为100/4/80时,材料的压电性能最佳,达到45.7 PC/N。随着PZT用量和极化时间增加,压电阻尼复合材料的阻尼因子峰值提高。 相似文献
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Takaaki Tsurumi Takashi Ichihara Kiyoshi Asaga Masaki Daimon 《Journal of the American Ceramic Society》1990,73(5):1330-1333
The admittance-curve-fitting method is proposed to determine material coefficients of semiconductive piezoelectric ceramics. In this method, the frequency dependence of admittance of a plate resonator is calculated around the resonance frequency, and the piezoelectric, elastic, and dielectric coefficients in the theoretical formula are refined to fit the observed data. The result of a simulation using four types of hypothetical ceramics with different conductivities and electromechanical coupling factors indicates that various constants determined by this method are more accurate than those by the conventional method. The fitting method is applied practically to the PZT ceramics and Bi,K-doped PZT ceramics which show semiconductivity. 相似文献
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Lead zirconate titanate (PZT) ceramics (Zr/Ti = 52/48) have been modified with different quantities of neodymium oxide (Nd2O3). The preparation was carried out via the solid-state-reaction route. The samples were calcined and sintered at 850°C and 1200°C, respectively. The structural evolution and the microstructure were investigated using an X-ray diffractometer (XRD) and a scanning electron microscope (SEM), respectively. The physical properties such as dielectric constants, piezoelectric coefficients, density etc. were also studied. 相似文献
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锆钛酸铅(PZT)粉体合成的研究进展 总被引:1,自引:0,他引:1
锆钛酸铅(PbZrxTi1-xO3,PZT)陶瓷是一类重要的铁电、压电、介电材料,其粉体的相组成、化学组成、热稳定性和烧结活性影响着陶瓷制品的铁电、压电和介电性能。本文详细综述了合成PZT粉体的固相反应法和湿化学方法的发展现状,并对几种合成方法的特点进行了评介,为低温合成纯相PZT粉体和PZT一维纳米结构指出了可能的方法。 相似文献
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《Journal of the European Ceramic Society》2007,27(13-15):3613-3617
This study investigated the influence of strontium doping on both the sintering behavior and the piezoelectric properties of PNZT–PNN ceramics. The piezoelectric ceramics was produced by solid state reaction between metallic oxides, strontium carbonates (SrCO3) and oxides precursors. NiNb2O6 precursors were mixed with the oxides to avoid the large-scale formation of pyrochlore phases during the sintering process and to favor the formation of the perovskite structure. Sintering experiments were accomplished between 900 °C and 1100 °C for PNZT–PNN with 0–4 mol% strontium. Dilatometer curves indicated that the densification of these samples occurs by 850 °C and the electromechanical characterization showed that strontium doping enhances the soft piezoelectric properties of the PZT–PNN ceramics.Consequently, a sintering temperature of 900 °C is sufficient to obtain doped PZT–PNN tablets with 99% of the theoretical density and excellent soft piezoelectric properties (ɛr > 4000; Kp > 60; d33 > 1000 pm/V). This makes those ceramics suitable for the construction of high efficiency actuators with low sintering temperature. The low Curie temperature is the only drawback of this material for some applications such as engine fuel injection. 相似文献