KOH对锆钛酸铅铁电微晶性质的影响  

Effect of KOH on Character of Lead Zirconate Titanate Crystallite

作　　者：李涛[1] 彭同江[2] 杨世源[3] 

机构地区：[1]西南科技大学工程技术中心,四川绵阳621010 [2]西南科技大学分析测试中心,四川绵阳621010 [3]西南科技大学材料科学与工程学院,四川绵阳621010

出　　处：《压电与声光》2010年第2期277-280,共4页Piezoelectrics & Acoustooptics

基　　金：国家自然科学基金资助项目(10476023)

摘　　要：用X-射线衍射仪(XRD)、扫描电子显微镜(SEM)、傅里叶变换红外光谱仪(FT-IR)等实验测试手段,研究了KOH浓度c(KOH)从1 mol/L变化到7 mol/L时,对锆钛酸铅(Pb(Zr0.52Ti0.48)O3,PZT)微晶体的晶粒度、晶体结构、晶粒形态、多晶颗粒形态的影响,同时对水热反应的机理进行了讨论。实验结果表明,当c(KOH)从3 mol/L增加到7 mol/L,均有效合成了四方晶相的钙钛矿结构的PZT微晶体;随着水热反应体系c(KOH)的增大,PZT微晶体的晶粒和颗粒尺寸增大、四方度(c/a)减小,晶粒和多晶颗粒均由立方体状变为球状;在浓强KOH水热反应液中,水合Zr(OH)4和Ti(OH)4在活化阳离子(K+)结构重构的作用下,吸附水合Pb(OH)2,经集结、脱水、结晶生成PZT微晶体。The effect of different concentration of KOH from 1 mol/L to 7 mol/L on the crystal granularity and the mierostructure as well as the crystal and particle morphology of lead titanate-zirconate （Pb（Zr0.52 Ti0.48 ）03, PZT） synthesized by the hydrothermal method has been investigated by XRD,SEM,FT-IR. The mechanism of hydrother- real reaction was discussed. The experimental result showed that the tetragonal PZT crystallite was synthesized effectively with perovskite structure when KOH concentration increased from 3 mol/L to 7 mol/L. With the increase of the concentration of KOH, the crystal and particle size increased and the tetragonality （c/a） decreased, the crystal grain and particle morphology changed from cubic to sphere. In the alkali hydrothefmal reaction solution, the hydroxide mixture consisted of Zr（OH）4 and Ti（OH）4 on which Pb（OH）2 is adsorbed under the action of cationic（K＋） re-organization mechanism. The PZT crystallites have been grown through the process of concentra- tion, dehydration and crystallization.

关 键 词：锆钛酸铅(PZT) 水热法 晶体结构 晶粒度 

分 类 号：TN304[电子电信—物理电子学]