改進的溶膠凝膠法制備鈮酸鍶鋇-鈦酸鍶鋇復相陶瓷研究.pdf

1、哈爾濱理工大學碩士學位論文改進的溶膠凝膠法制備鈮酸鍶鋇鈦酸鍶鋇復相陶瓷研究姓名：彭娟申請學位級別：碩士專業(yè)：材料學指導教師：張顯友20080101哈爾濱理工大學工學碩士學位論文CharacterizationofModifiedS01GelDerivedxSrO(1一x)BaOyNbeOs(1一y)Ti02CompositeCeramicsAbstractStrontiumbariumniobatewithtetragonaltungs

2、tenbronzestructureandbariumstrontiumtitanatewithperovskitestructurehaveattractedlotsofattentionduetotheiroutstandingdielectricalpropertiesandpotentialapplicationsHoweverSBNwithdefectthatwasdifficultsinteredtoahighdensity

3、andcanabnormalgraingrowSothecompositematerialwithgooddielectricproperties，mechanicalpropertiesmaybeobtainedbyacompositeofBSTandSBNInthispaper(1x)BaO‘xSrO。(1y)Ti02‘yNb20s(BSTNinshort)withcoexistenceoftheperovskiteandtungs

4、tenbronzephasesweresuccessfullypreparedbyamodifiedsol—gelmethod，andtheformationmechanismofthecompositeceramicswasinvestigatedindetailsTheeffectofdifferentSr／BaratioandNi／Tiratiotothestructureandpropertiesofthematerialswe

5、realsostudiedSomeinstrumentswerechoseincludedXraydiffraction(XRD)，scanningelectronmicroscope(SEM)，impedanceinstrumentandalsoLCRdigitalbridgeFollowingresultscanbeobtainedfromthepaper：(1)Comparetothetraditionalsolidmethod，

6、thismodifiedsolgelcanshortenthesinteringtimeandlowerthecrystallizingtemperaturewhilewithagoodcombinationofthetwophasewithoutanyabnormalgraingrowth；(2)Thepresinteringtemperaturewaschosenat800℃throughthermalanalysisandahea

7、tingcurewasmade；(3)ByanalysisthesinteringmechanismcangotthattheformationtemperatureofSBNishigherthanthatofBSTandthecompositeceramicssinteringtemperaturewasdeterminedat1250“Cfor3h；(4)BSTandSBNcanbecoexistedinthesystemwell