Zr^(4+)B位置换对(Pb_(0.5)Ca_(0.5))(Fe_(0.5)Nb_(0.5))O_3陶瓷微波介电性能的影响  

Microwave dielectric properties of(Pb_(0.5)Ca_(0.5))(Fe_(0.5)Nb_(0.5))O_3 ceramics substituted by Zr for B-site

作　　者：江永长[1] 顾莹[1] 杨秋红[1] 金应秀 

机构地区：[1]上海大学材料科学与工程学院,上海200072 [2]韩国京畿大学陶瓷工程系

出　　处：《功能材料》2011年第1期148-150,154,共4页Journal of Functional Materials

基　　金：国家高技术研究发展计划(863计划)资助项目(715-006-0060);国家自然科学基金资助项目(60578041)

摘　　要：研究了Zr4+离子B位置换改性(Pb0.5Ca0.5)(Fe0.5Nb0.5)O3陶瓷微波介电性能。实验结果表明,(Pb0.5Ca0.5)[(Fe0.5Nb0.5)1-yZry]O3(PCFNZ)陶瓷样品呈现单一斜方钙钛矿相结构。随Zr4+离子的置换量增加,PCFNZ陶瓷体系的Qf值和晶粒尺寸逐渐减小;介电常数εr随着置换量增加而提高,这主要是因为Zr4+的离子极化率(αZr=0.325nm)大于(Fe,Nb4)+离子极化率(αB-site=0.313nm)。频率温度系数TCF则随置换量增加开始阶段保持不变,而后急剧减小,由正变负值。当烧结温度为1150℃,Zr4+的置换量在y=0.08时,能够获得优良的微波介电性能:Qf=4938GHz,εr=111,TCF=9.06×10-6/℃。Microwave dielectric properties of B-site substitution by Zr4＋ in（Pb0.5Ca0.5）[（Fe0.5Nb0.5）1-yZry]O3（PCFNZ） ceramics were investigated.All specimens that were substituted by Zr4＋ were well sintered and single orthorhombic perovskite phase.Qf values and grain sizes of PCFNZ ceramics decreased with the increase of Zr4＋ content.The dielectric constant εr increased with the increase of Zr4＋ content because of larger ionic polarizability of Zr4＋ ion（αZr=0.325nm） than that of（Fe,Nb）4＋ ions（αB-site=0.313nm）.With the increase of Zr4＋ content,the TCF firstly kept almost unchanged,and then drastically decreased from positive to negative.Typically,when Zr4＋ content was at y=0.08,the excellent microwave dielectric properties of Qf=4938GHz,εr=111 with TCF=9.06×10-6/℃ were obtained.

关 键 词：(Pb0.5Ca0.5)[(Fe0.5Nb0.51)-yZry]O3 微波介电性能 B位置换 

分 类 号：TQ174[化学工程—陶瓷工业]