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ID:43926079
大小:4.73 MB
页数:140页
时间:2019-10-16
《ceo- 2c2-基固体电解质的低温燃烧合成及性能研究》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、博十学位论文activationenergywas0.85eV.Cel.xYx02.x/2nanopowderswerepreparedbyalow—temperaturecombustionsynthesismethod.TheinfluenceoftheY”一dopedconcentrationonthesinteringproperties,ionicconductivityandflexuralstrengthofCe02wasstudied.Ramanresultshowedthatthesolidsol
2、ubilitylimitofY”inCe02wasbetween30m01%and35m01%ThelatticeparameteroftheCel.xY。02一“2didnotdecreaselinearlywithincreasingthedopantcontentofY3+.AcompositionwithhigherY3+ionscontentdensifiedwithgreaterdifficultythancompositionswithlowerY”ionsdopantconcentration.Th
3、erelativedensityandtheaveragegrainsizeofCel.xYx02.“2decreasedwithincreasingtheY’+ionsdopantconcentrationandtherelativedensificationrate/graingrowthrateratioincreasedwithincreasingtheY”一dopedconcentration.ThegrainconductivitydecreasedwiththeincreaseoftheY”一dope
4、dconcentration,butthegrainboundaryconductivityfirstlyincreasedwiththeincreaseoftheY3*-dopedcontentandthendecreased.ThemaximumgrainboundaryconductivityWasobtainedwhentheY”一dopedcontentwas20t001%.ThetotalconductivityoftheCel.xYx02.rd2wasmainlydeterminedbythegrai
5、nboundaryconductivity,andthetotalionicconductivityhadthesamechangetendencyasthegrainboundaryconductivitywiththeincreaseoftheY”一dopedcontent.Thehighesttotalconductivityandlowestactivationenergywereachievedwhenthey3+-dopedcontentWas20m01%.TheA1203/CeosYo20I.9com
6、positepowderswith0-10t001%A1203werepreparedbyasol—gellow—temperaturecombustionprocess.TheinfluencesofA1203contentonsintering,behaviorandflexuralstrengthofAl203/Ceo8Yo201.9compositeswereinvestigated.TheeffectofA1203additionsonthetotalconductivity,thebulkconduct
7、ivityandthegrainboundaryconductivityofA1203/Ceo.8Yo.20I.9compositeswerealsodiscussedandthemechanismwasanalyzed.ThebackscatteredSEManalysisshowedthesolidsolubilitylimitofA1203inCeo.8Yo.201.9wasbetweeno.5m01%andlm01%.Belowthesolidsolubilitylimit,A1203couldpromot
8、ethesinteringofCeo.sY02019duetOthesmallsizeeffectofAI”.WhenthedopedconcentrationofA1203inCeosYo20l9Wasoveritssolidsolubilitylimit,A1203particlesgatheratgrainboundariesandtheyrestra
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