0.95(K_(0.5)Na_(0.5))NbO_3-0.05Li(Nb_(0.5)Sb_(0.5))O_3无铅压电陶瓷的显微结构分析与电学性能  

Microstructure and Electrical Properties of 0.95(K_(0.5)Na_(0.5))NbO_3-0.05Li(Nb_(0.5)Sb_(0.5))O_3 Ceramics

作　　者：赵永杰[1] 赵玉珍[1] 黄荣厦[1] 刘荣正[1] 周和平[1] 

机构地区：[1]清华大学新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《稀有金属材料与工程》2011年第S1期405-407,共3页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50972073)

摘　　要：采用传统固相反应合成法制备0.95(K0.5Na0.5)NbO3-0.05Li(Nb0.5Sb0.5)O3基无铅压电陶瓷,研究了烧结温度对0.95(K0.5Na0.5)NbO3-0.05Li(Nb0.5Sb0.5)O3陶瓷相结构、显微组织和压电介电性能的影响。结果表明,在960~1060℃的温度区间内,所得到的一系列烧结样品在室温下均为纯的钙钛矿型结构,未观察到第二相出现;随着烧结温度的升高,晶粒的平均尺寸显示出先增大后减小的趋势,在1020℃时晶粒的平均粒径达到最大值3.5μm。电学性能分析表明,烧结温度为1020℃时,该体系陶瓷压电介电性能达到最优值:d33=245pC/N,kp=0.42,tanδ=0.03,ε3T3/ε0=640,Ec=2.1kV/mm,Pr=20μC/cm2。Lead-free piezoelectric ceramics 0.95(K0.5Na0.5)NbO3-0.05Li(Nb0.5Sb0.5)O3 (KNN-5LNS) were synthesized by the conventional ceramic sintering technique. The phase structure, microstructure and electrical properties of KNN-5LNS ceramics were investigated. The results of XRD indicate that KNN-5LNS possess a pure tetragonal structure. With the sintering temperature increasing, the average size of grains first increases and then decreases. Maximum value 3.5 μm was obtained for samples sintered at 1020 ℃. The KNN-5LNS sintered at 1020 ℃ obtains the optimum electrical properties: d33=245 pC/N, kp=0.42, tanδ=0.03, =640, Ec=2.1 kV/mm, and Pr =20 μC/cm2

关 键 词：无铅压电陶瓷 晶体结构 压电性能 介电性能 

分 类 号：TM282[一般工业技术—材料科学与工程]