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Ce-La-O体系相图热力学及应用(英文).docx

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Ce-La-O体系相图热力学及应用(英文) ThermodynamicsandApplicationsofCe-La-OPhaseDiagram TheCe-La-Osystemisanimportantternarysysteminthefieldofmaterialscience,duetoitsnumerousapplicationsinceramicmaterials,catalysts,andoxygenstoragematerials.ThephasediagramoftheCe-La-Osystemisofgreatsignificance,asitcanbeusedtopredictthethermodynamicbehaviorofthesystemandoptimizematerialsproperties. ThephasediagramofCe-La-Osystemisacomplexandintricateonemadeupofvariousbinaryandternaryphases.Itisaheavilyresearchedsystemduetoitsversatileapplications.TheCe-La-Osystemhasabroadrangeofcompositionswherethemoststablephaseisfluorite,andthereisacleardecreaseinstabilitytotheperovskitestructureathigherconcentrationsofceriumoxide. OneofthekeyfindingsoftheCe-La-Osystemistheexistenceofahomogeneityrangeforthecubicfluoritephase.ThestudyshowedthatthefluoritephaseintheCe-La-Osystemisnotapurecompound,butratherasolidsolutionofvaryingcomposition.Therangeofhomogeneitydependsontheconcentrationofthecomponentsandtemperatureofthesystem. Anothersignificantphaseistheperovskitephase,whichappearsinthehighceriumoxideconcentration.Thisphasehasarangeofcompositionsandexistsacrossvarioustemperatures.TheperovskitestructureintheCe-La-Osystemisuniqueandoffersawiderangeofapplicationssuchaselectronicconductivityandoxygeniontransport. Furthermore,anoteworthyareaofresearchisthecatalyticpropertiesoftheCe-La-Osystem.ThepresenceofoxygenvacanciespresentintheceriumoxideandLa2O3phasesallowsforoxygenexchangetotakeplace.ItisobservedthatsmalladditionsofceriumoxidetoLa2O3improvecatalyticactivitybyactingasanoxygenbuffer. TheapplicationoftheCe-La-Ophasediagramcanbedemonstratedinthedesignofceramicsforsolidoxidefuelcells(SOFCs).Solidoxidefuelcellsoperateatanelevatedtemperatureofabove800°C,whichrequiresthematerialsusedtohaveahighthermalstability.TheCe-La-Osystemprovidesawiderangeofstablecompositions,whichcanbeutilizedindesigningSOFCs. Inconclusion,theCe-La-Osystemisawell-researchedternarysystemwithacomplexphasediagram.Thediscrepanciesinthehomogeneityrange