论文部分内容阅读
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(Zr_(0.52)Ti_(0.48))O_3,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 microstructure as well as the crystal and particle morphology of lead titanate-zirconate (Pb(Zr_(0.52)Ti_(0.48))O_3,PZT) synthesized by the hydrothermal method has been investigated by XRD,SEM,FT-IR. The mechanism of hydrothermal 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 hydrothermal 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 concentration, dehydration and crystallization.