改進(jìn)的溶膠凝膠法制備鈮酸鍶鋇-鈦酸鍶鋇復(fù)相陶瓷研究.pdf

1、哈爾濱理工大學(xué)碩士學(xué)位論文改進(jìn)的溶膠凝膠法制備鈮酸鍶鋇鈦酸鍶鋇復(fù)相陶瓷研究姓名：彭娟申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：材料學(xué)指導(dǎo)教師：張顯友20080101哈爾濱理工大學(xué)工學(xué)碩士學(xué)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