超重力共沉淀法制备纳米钛酸钡的研究  

Preparation of Nano-Barium Titanate by High Gravity Coprecipitation

作　　者：梁雅璐 袁志国[1,2] 马瑶[1,2] 李宇龙 LIANG Yalu;YUAN Zhiguo;MA Yao;LI Yulong(School of Chemistry and Chemical Engineering,North University of China,Taiyuan 030051,China;Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学化学与化工学院,山西太原030051 [2]中北大学超重力化工过程山西省重点实验室,山西太原030051

出　　处：《中北大学学报（自然科学版）》2023年第3期272-278,285,共8页Journal of North University of China(Natural Science Edition)

基　　金：山西省回国留学人员科研资助项目(2021-120)。

摘　　要：针对工业制备BaTiO_(3)粉体存在粒度分布不均、粒径大等难题,采用撞击流-旋转填料床(IS-RPB)反应器共沉淀法制备Sm^(3+)掺杂BaTiO_(3)纳米颗粒。考察了超重力因子、撞击初速度、掺杂浓度等因素对纳米钛酸钡粒径和粒度分布的影响规律。结合X-射线衍射仪(XRD)、扫描电子显微镜(SEM)、红外光谱仪(FT-IR)、同步热分析仪(TG-DSC)以及纳米粒度分析仪对产物形貌、粒径等进行了表征分析。研究结果表明:IS-RPB反应器制备得到的BaTiO_(3)纳米颗粒粒径小且粒度分布均匀,高温煅烧后呈现四方相;在撞击初速度21.24 m/s、超重力因子45、掺杂浓度0.3%、煅烧温度950℃、保温时间2 h时,其粒径最小,为65 nm;陶瓷体在烧结温度1150℃、烧结时间2 h时密度为6.4 g/cm^(3),有利于提高其介电性能和陶瓷的稳定性。本文提出的超重力共沉淀法制备纳米钛酸钡是一种可在工业上拓展的制备方法。For the problems of uneven particle size distribution and large particle size of industrially prepared BaTiO_(3) powders,Sm^(3+)doped BaTiO_(3) nanoparticles were prepared by impinging stream-rotating packed bed(IS-RPB)co-precipitation method.The effects of high gravity factor,initial velocity of impact and doping concentration on the particle size and particle size distribution of barium titanate were investigated.X-ray diffraction(XRD),scanning electron microscope(SEM),infrared spectrometer(FT-IR),synchronous thermal analyzer(TG-DSC)and nano particle size analyzer were used to characterize the product morphology and particle size.The results show that the BaTiO_(3) prepared by the impinging stream-rotating packed bed reactor has small particle size and uniform particle size distribution,and is tetragonal after high temperature calcination.The smallest particle size of 65 nm was obtained at an initial impact velocity of 21.24 m/s,a supergravity factor of 45,a doping concentration of 0.3%,calcination temperature of 950℃and holding time of 2 h.And the density of the ceramics body was 6.4 g/cm^(3) at sintering temperature of 1150℃and sintering time of 2 h,which is favorable to improve the dielectric properties of thin dielectric layers and ceramic stability.The preparation of barium titanate by high gravity co-precipitation method proposed in this paper is an industrially scalable preparation method.

关 键 词：共沉淀法 撞击流-旋转填料床 纳米钛酸钡 掺杂 粒度分布 

分 类 号：TQ132.3[化学工程—无机化工]