烧结载量对Zn-Bi片式压敏电阻器电性能的影响

通过烧结工序中0402型低压产品装载量不同的试验，研究了它们对Zn-Bi系片式ZnO压敏电阻器电性能的影响。结果表明：当配方体系中Bi2O3摩尔分数为0．6％，装载量为10g时，产品的电性能最好，非线性系数大于30，漏电流小于5μA。     

掺杂对钛酸锶压敏陶瓷性能的影响

研究了施主掺杂和受主掺杂对SrTiO3压敏陶瓷材料微观结构和电性能的作用。研究结果表明，La、Nb进行双施主掺杂时按一定比例能获得较低的压敏电压；以La进行单施主掺杂，含量为1．2mol％时，压敏电压最低。双施主掺杂的压敏电压要高于单施主的电压。以CuO进行受主掺杂的效果要好于以MnCO3进行受主掺杂的效果。     

ZnO压敏电阻器低压化浅谈

国内外有关ZnO压敏电阻器低压化方法方面的研究报道很多。本文在整理诸多文献资料的基础上，按照各种方法的理论依据对它们进行了较为系统的归类及评述，并对ZnO压敏电阻器低压化方法的发展趋势作了初步探讨。     

片式叠层压敏电阻器的发展和应用

本文论述了国外开发的几种片叠层压敏电阻的结构,特性及当前的发展方向,介绍了这类压敏电阻器在集成电路保护,汽车电路保护和ＣＭＯＳ器件保护等方面的应用。     

压敏电阻器的应用与发展

概述了压敏电阻器尤其是氧化锌压敏电阻器的应用及发展动向。     

浅谈ZnO压敏电阻器低压化

近几十年来,国内外有关ZnO压敏电阻器低压化的研究报道很多。本文对低压化的方法作了较为系统的归类及评述,并对其发展趋势作了初步探讨。     

提高ZnO压敏电阻器的可靠性的分析

分析了ＺｎＯ压敏电阻器在可靠性方面的影响因素,提出了提高产品可靠性的途径。     

Microstructure and electrical properties of Nb-doped SrTiO3-BiFeO3 based lead-free ceramics

In this work, Nb-doped 0.75SrTiO₃-0.25BiFeO₃ (ST-BF) lead-free ceramics are designed and synthesized using a conventional solid-state reaction method. The influence of Nb doping on the microstructure, dielectric, and electrical properties are systematically investigated. With the increase of Nb concentration, the crystal structure of ST-BF remains pseudo-cubic as exhibited in the X-ray diffraction patterns. The grain size is found to increase from 0.33 to 6.23 μm, and then decrease to 1.88 μm by Nb doping, along with a clear heterogeneous core–shell microstructure. A relatively low dielectric loss (∼0.1, at 1 kHz) and a stable dielectric constant (∼700, at 1 kHz) are obtained for the 0.03 Nb-doped ST-BF composition at room temperature. Impedance spectroscopy analysis shows that Nb doping in ST-BF increases the total resistivity, forming an electrically conductive core and a nonconductive shell, with enhanced activation energy. The results may provide a feasible approach to develop novel ST-based lead-free dielectric ceramics for capacitor applications.     

Hydrothermal synthesis of Litchi-like SrTiO3 with the help of ethylene glycol

Templated by TiO₂ microspheres , litchi-like SrTiO₃ crystals with a narrow size distribution and monodispersity were synthesized through the combination of regulating the ethylene glycol concentration during the hydrothermal process and the post heat treatment. The results show that when the volume ratio of water and ethylene glycol reached 10:70, microsized SrCO₃ was firstly formed under the hydrothermal process, and then the litchi-like SrTiO₃ powder was obtained after the postheat treatment at 700°C for 4 hours, which shows a large specific surface area of 37.41 m²/g. It is found that the concentration of ethylene glycol aqueous solution plays an important role on the morphology of the SrTiO₃ crystals, and the slightly higher viscosity and proper amount of OH hydroxyl groups facilitate the formation of the micrometer spherical hierarchical surface.     

SrTiO3复合功能陶瓷的AC阻抗谱研究

本文采用一次烧成法制备出SrTiO3电容-压敏复合功能陶瓷,测试了样品的交流阻抗谱,确定了样品的等效电路,分析了不同氧化热处理条件下的晶粒和晶界电学特性.结果表明,SrTiO3复合功能陶瓷晶界存在多种受主态形态,氧化热处理过程中晶粒保持其半导体特性,晶界绝缘程度显著提高.     

MnZn铁氧体/SrTiO3/PTFE复合材料的制备与表征

采用SrTiO3溶胶对MnZn铁氧体进行表面改性，得到MnZn铁氧体／SrTiO3复合粉体，以PTFE为基体，制备了的MnZn铁氧体／SrTiO3／PTFE复合材料。采用HP4292B和HP4294对复合材料电磁性能进行了表征。结果表明：复合材料在低频阶段具有较高磁导率和介电常数以及较低磁损耗和介电损耗，复合材料的介电频率响应符合德拜弛豫理论。     

Low-temperature sintering and electrical properties of BBSZ glass-doped ZnO-based multilayer varistors

The effect of Bi₂O₃-B₂O₃-SiO₂-ZnO glass (denoted as BBSZ) content on the densification, microstructure, and electrical properties of ZnO-based multilayer varistors (MLVs) has been investigated. In ZnO-based (MLVs), BBSZ acted as a promoter in ZnO grain growth, which increased the grain size of ZnO, resulting in a decrease in breakdown voltage. Results showed that the adding of BBSZ glass had an improvement in densification and overall properties of MLVs. It was found that a maximum value of 5.45 g/cm³ of the bulk density and the optimum properties (V_1mA = 27.28 V, α = 40.33, I_L = 0.75 μA, I_p = 35 A) of ZnO-based MLVs were achieved with 3 wt% BBSZ glass sintered at 925°C for 3 hours.     

油酸辅助水热合成纳米钛酸锶的性能调控与表征

采用油酸辅助一步水热法,以廉价易得的锐钛矿型TiO2为钛源、Sr(OH)2?8H2O为锶源合成SrTiO3纳米颗粒,通过XRD, TEM和SEM研究了SrTiO3纳米颗粒的形貌,考察了反应时间、Sr/Ti摩尔比和油酸浓度对SrTiO3纳米颗粒性能的影响,以所制SrTiO3为催化剂降解亚甲基蓝考察其光催化性能。结果表明,钙钛矿型立方相SrTiO3纳米颗粒具有均匀的尺寸和规则的形貌。实验范围内,随反应时间和Sr/Ti摩尔比增加,SrTiO3纳米粒子的晶粒尺寸呈增加趋势;随油酸浓度增加,SrTiO3颗粒粒度呈下降趋势。添加油酸可调控制备出具有规则形貌的钙钛矿型立方相结构的SrTiO3纳米颗粒;Sr/Ti摩尔比为0.75时,产品纯度高、结晶度好。油酸、反应时间和Sr/Ti摩尔比对SrTiO3纳米粒子微观结构的影响可分别用颗粒间作用力、奥斯特瓦尔德熟化和晶体成核理论解释。     

Structure and electrical properties of Zn-doped BiFeO3 films

BiFe_1−xZn_xO₃ (x = 0, 0.5, 1, 1.5, 2 mol%) (BFZO) films were prepared on ITO/glass substrates by a sol-gel method. The effects of different Zn contents on the structures and electrical properties of the BFZO films were investigated. From X-ray diffraction (XRD), microstructure and X-ray spectroscopy (XPS) results, the BFZO films with a Zn content of 1 mol% showed a better crystal structure and grain development, and the Fe²⁺ and oxygen vacancy concentrations in this sample were the lowest among all the evaluated BFZO films. The P-E hysteresis loop indicated that the BFZO films with 1 mol% Zn had the highest remanent polarization (2Pr), which was 82.4 μC/cm², along with a coercive field (2E_c) of 887 kV/cm at the tested electric field of 857 kV/cm. The BFZO film with 1 mol% Zn had the lowest leakage current density, which was 3.54 × 10⁻⁷ A/cm² at the tested electric field of 200 kV/cm. Both at high and low electric fields, the space charge-limited current (SCLC) conduction mechanism was the main leakage mechanism. When the test frequency was 10⁵ Hz, the dielectric constant was 133, and the dissipation factor was 0.015.     

表面活性剂辅助Sol-gel法SrTiO3粉体的形状控制合成

应用Sol-gel法成功合成了纳米SrTiO3粉体。酞酸丁酯和氯化锶为金属离子源,先驱体以甲醇为溶剂、柠檬酸为螯合剂、乙酰丙酮为稳定剂、聚乙二醇和聚乙烯醇为模板。干先驱体经700℃1h烧成后得到纯的SrTiO3粉体。研究了表面活性剂对粉体的粒子尺寸和形貌的影响。合成粉体的聚乙二醇诱导了均匀的较小的圆形粒子。聚乙烯醇则使合成粉体为较大尺寸的长板柱状的粒子。     

水热法合成纳米PbSnO_3粉体的研究

采用水热法合成出PbSnO3粉体。并用XRD、SEM对粉体的晶体结构和微观形貌进行分析和表征。结果表明:当矿化剂浓度NaOH为1mol·L-1,反应时间为12h,温度为180℃时,获得粒度均匀的锡酸铅粉体。     

稳定的SrTiO3陶瓷浆料的制备

本采用胶体“电空间稳定机制”，以PMAA-NH4为分散剂，以沉降高度作为衡量浆料稳定性的参数，研究了SrTiO3粉末的悬浮流变特性及分散剂PMAA-NH4加入量对SrTiO3浆料稳定性的影响。在最佳pH值和分散剂加入量条件下，制备了高固相含量（50vol%)，稳定性和分散性好的SrTiO2浆料。