水热重结晶法制备四方相纳米Ba_(0.9)Ca_(0.1)TiO_3晶体的研究  

Study on Hydrothermal Recrystallization Method for Synthesis of Tetragonally Structured Ba_(0.9)Ca_(0.1)TiO_3 Nanocrystals

作　　者：张维维[1] 沈志刚[1] 闫涛[1] 陈建峰[1] 

机构地区：[1]北京化工大学纳米材料先进制备技术与应用科学教育部重点实验室教育部超重力工程研究中心,北京100029

出　　处：《化学学报》2006年第6期574-578,共5页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.20236020;20325621);北京市科技新星基金(No.9558103500);霍英东教育基金(No.81063)资助项目.

摘　　要：采用水热重结晶法对低温液相法制备的Ba0.9Ca0.1TiO3(B0.9C0.1T)浆料进行220℃,3h的水热处理,成功制备了四方相B0.9C0.1T纳米粉体.并对水热重结晶和未水热处理的两种粉体进行了TEM,XRD,Raman,FT-IR,TG和介电性能的表征.研究表明,经水热重结晶后的B0.9C0.1T粉体体系发生从顺电立方相向铁电四方相的转变,羟基缺陷以及CO32-杂质显著减少,粉体形貌由外边缘毛躁的球形转变为四边形.并发现羟基缺陷的减少是影响体系相转变的关键因素.A novel hydrothermal recrystallization route has been developed to produce tetragonal Ba0.9Ca0.1TiO3 nanocrystals. The obtained powders were analyzed by TEM, XRD, Raman spectra, FTIR, TG and dielectric property measurements, and showed much less hydroxyl lattice defects, higher purity and better crystallinity than those prepared by low-temperature aqueous synthesis （LTAS） method. The hydroxyl lattice defect was key factor to influence the phase transition from paraelectric cubic to ferroelectric tetragonal structure.

关 键 词：Ba0.9Ca0.1TiO3 水热重结晶 羟基缺陷 

分 类 号：O611.3[理学—无机化学]