纳米Sr_xCa_(1-x)TiO_3固溶体粉体的制备及性能表征  

Preparation and characterization of nano-sized Sr_xCa_(1-x)TiO_3 solid-solution powders

作　　者：和平[1] 程华容[1] 乐园[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,北京100029

出　　处：《北京化工大学学报（自然科学版）》2007年第5期495-499,共5页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家自然科学杰出青年基金(20325621)

摘　　要：采用低温液相法以廉价的TiCl4、SrCl2、CaCl2为原料,以NaOH溶液为沉淀剂一步合成了纳米SrxCa1-xTiO3固溶体粉体。为了提高粉体颗粒结晶度,改善形貌,进行了水热后处理。通过XRD,TEM,FT-IR,TG和ICP等表征手段对所得粉体的物相、形貌、颗粒尺寸及分布、杂质含量、Ca2+与Ti4+摩尔比进行了分析和测试。结果表明,SrxCa1-xTiO3在0.1≤x≤0.9范围形成了固溶体,且随x的增大相结构从斜方相逐渐过渡到立方相。水热处理前粉体结晶度低,形貌不规整,而进行水热处理后粉体中O—H缺陷和CO32-杂质显著减少,结晶度提高,形貌规整均匀,随着x从0.3增加到0.9,颗粒粒径从230 nm减小到65 nm(水热处理前:从220 nm减小到45 nm)。Nano-sized SrxCa1-xTiO3 solid-solutions have been prepared by low-temperature aqueous synthesis method （LTAS） from cheap starting materials. To improve the morphology and crystallinity of the particles, the hydrothermal post-treatment was followed. The as-obtained powders were analyzed by TEM, XRD, FTIR, TG and ICP measurements. It is shown that as-prepared powders are in form of homogeneous solid solutions of which the crystal structure depends on the composition. Compared with the powders prepared by LTAS method, the powders after hydrothermal post-treatment showed much less hydroxyl defects, higher purity, uniform morphology and better crystallinity. The particle size decreased from 220 nm to 45 nm when the composition Sr increased and somewhat grew after the hydrothermal post-treatment.

关 键 词：纳米颗粒 固溶体 SrxCa1-xTiO3 羟基缺陷 

分 类 号：TM504[电气工程—电器]