1、分類號：——密級：——Y89368TY893700單位代碼：!Q!!學號：2QQj22Q西北大學碩士學位論文題目：企墊墨鏖整整型叢墮塑叁企墊鹽盤盟型查作者：里熟指導教師：蕉這專業(yè)技術職務：劍整蕉學科(專業(yè))：垡鱟(垂墊垡堂)答辯日期：)伊66占學位授予IEI期：二00六年六月PreperationofTemperatureStableDielctricCeramicsBasedonBariamTitanateAbstractThepre

2、parationandthedielectricpropertyoftemperaturestabledielectricmaterialsbasedonBariumTitanatehavebeeninvestigatedinthisdissertation1TheBaTi03nanosizedpowderswimparticlesabout60～70nmandfine—grainedceramics(O7～10pm)areprepar

3、edbySol—GelmethodWhentheNb／Catiois15～20，thecontentsofCoandNdbethareO70m01％，theX7Rceramicswithdielectricconstantaround3000atroomtemperaturewerepreparedatwiderangesofthecalciningandsinteringtemperature2Thellanosizedandhomo

4、geneouspowderswithparticlesabout40～60nn1andceramicsofManganese—dopedBaTi03werepreparedbySol—GetprocessBecauseoftheeffectofthesuperfluousManganeseadditives，thesecondphasesuchashexagonalBaTi03andBaMn03areformedeasilyTheopt

5、imumcalciningandsinteringtemperatureare800“Cand1250Cfor2hoursrespectivelyWiththeincreaseofManganesecontent，the8一TcurvegetsflatalthoughthedielectricconstantoftheceramicdecreasesobservablyAstheManganesecontentiswithin050m0

6、1％theceramichasnottoomuchlossofdielectricconstant，andothergoodcharacteristicssuchasdielectriclossandtemperaturedependenceofpermittivityaccompaniedit3Thenano—sizedandhomogeneouspowderswithpaniclesabout50hmandceramicsofSil

7、icondopedBaTi03werepreparedbySolgelprocessBecauseoftheeffectofthesuperfluousSiliconadditives，thesecondphaseBa2TiSi20sisformedeasilyTheexistenceofBazTiSi20sdecreasesthedcnsificationandthedielectricconstantbecauseitisnotFe