合成方法对0.2PZN-0.8PZT陶瓷交流阻抗性能的影响  

Effect of Synthesis Method on Impedance Characteristics of 0.2PZN-0.8PZT Ceramic

作　　者：郑木鹏[1] 侯育冬[1] 朱满康[1] 严辉[1] 

机构地区：[1]北京工业大学,北京100124

出　　处：《稀有金属材料与工程》2013年第S1期208-211,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51072008);北京市自然科学基金(2102006)

摘　　要：分别采用一步固相法和二步预产物法合成0.2PZN-0.8PZT压电陶瓷,并对样品进行微结构和交流阻抗性能解析。结果表明两种方法均制备出纯钙钛矿相陶瓷。但是,二步预产物法合成的陶瓷晶粒尺寸显著增大且均一性提高。在相同阻抗测试温度区域,二步预产物法合成的陶瓷弛豫时间范围明显变宽,表现出较强的弛豫性。根据阿累尼乌斯公式对弛豫时间进行拟合,可以看出二步预产物法得到陶瓷激活能大于一步固相法合成样品,具有较低的氧空位浓度。0.2PZN-0.8PZT piezoceramics have been prepared by a conventional mixed oxide method and the two-step calcination process. The corresponding microstructure and AC impedance spectrum have been investigated. The results reveal that the specimens prepared by both methods show a complete perovskite structure. However, the microstructures of the specimen prepared by the two-step calcination process are more homogeneous and the grain sizes are increased greatly. Meanwhile, the relaxation time region of these specimens shows a broader feature compared to the specimens prepared by a conventional mixed oxide method in the same impedance test temperature area, which suggests that relaxor behavior has been enhanced. In addition, temperature dependence of bulk relaxation time is found to obey linear-Arrhenius fit for specimens prepared by both methods. The calculation results indicate that the specimens prepared by the two-step calcination process have the larger activation energy values, which correspond to the lower concentration of oxygen vacancies.

关 键 词：合成方法 微观结构 交流阻抗 介电弛豫 激活能 

分 类 号：TM282[一般工业技术—材料科学与工程]