文档介绍：铁酸钡粉体的水热合成及性能li}f究粒径减小。但用量过大时会导致杂质相BaS04生成。十二烷基三甲基氯化铵和聚乙二醇对粉体粒径影响较小。但当三种表面活性剂添加量适当时,都能明显改善粉体的分散性。有机溶剂异丙醇和乙醇均能减小BT粉体的平均粒径并改善其分散性,且效果明显好于三种表面活性剂。当反应温度为200"C,反应时间为4小时,乙醇浓度为25%时,合成了分散性良好,平均粒径约50nm的BT粉体,其粒径分布宽度doo-dlo仅约100nm。升高反应温度到240。C,制得粒径分布宽度基本不变,平均粒径约84nm,且d90和dlo变小,团聚指数AF(50)仅为l的粉体,其颗粒的均匀性和分散性得到进~步改善。水热合成BT粉体常规烧结工艺条件下的适宜烧结温度约为1250℃,此时其陶瓷的介电常数达到最大值。BT粉体的Ba/Ti比越接近于1,粉体结晶越完善,烧结后陶瓷的介电常数越高。微量组分Nb205或Nd203的掺入对BT陶瓷的介电常数和介质损耗影响较大,当Nb、%、%时,BT陶瓷的介电常数和介质损耗都达到最大。关键词:水热合成;钛酸钡;助剂;纳米粉体;陶瓷性能济南人学顾Ij学位论文ABSTRACTBariumtitanate(BT)isanimportantfundamentalmaterialofelectricalceramicbecauseofitsexcellentperformance,onstant,goodferroelectricandpiezoelectricproperties,withstandingvoltageandinsulation,(),thermistors,,ConsumerElectronics),industrytominiaturizationandhighcapacitance,,,theeffectsofreactiontemperature,reacfantconcentration,reactantBaJTi,reactiontimeanddifferentsourcesoftitanium,threekindsofsurf￡ictant(sodiumdodecylbenzenesulphonate,SDBS;dodecyltrimethylammoniumchloride,DTAC;polyethyleneglycol2000,PEG)anicsolvents(ethanolandisopropan01)arestudiedontheBTpowders’?morphology,position,particlesize,thespecificsurfacearea,theBa/Tiofpowderanditsceramicpropertieshavebeenmeasuredusingtransmissionelectronmicroscopy(TEM),laserparticlesizeanalyzer,thespecificsurfaceareameasurementinstrument,theX·raydiffraction(XRD),andX—rayFluorescenceSpectrometer(XRF).Theresearchresultsareasfollowed:Theeffectsofreactiontemperature,reactantconcentration,reactantBa/Ti,reactiontimeanddifferentsourcesoftitaniumtopowders?