ceo- 2c2-基固体电解质的低温燃烧合成及性能研究

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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