Anomaly diffuse and dielectric relaxation in strontium doped lanthanum molybdate

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1、MaterialsResearchBulletin46(2011)2502–2505ContentslistsavailableatSciVerseScienceDirectMaterialsResearchBulletinjournalhomepage:www.elsevier.com/locate/matresbuAnomalydiffuseanddielectricrelaxationinstrontiumdopedlanthanummolybdateXiaoLiu,HuiqingFan*,Jin

2、gShiStateKeyLaboratoryofSolidificationProcessing,SchoolofMaterialsScienceandEngineering,NorthwesternPolytechnicalUniversity,Xi’an710072,ChinaARTICLEINFOABSTRACTArticlehistory:ThedielectricpropertiesoftheLa2xSrxMo2O9d(x=0–0.2)ceramicswereinvestigatedinth

3、eReceived11March2011temperaturerangeof300–800K.Dielectricmeasurementrevealsthattwodielectricanomalies,Receivedinrevisedform3July2011associatedAcceptedwiththeoxygeniondiffusion,existinfrequencyspectrumwithx=0.5.Thebroaddielectric15August2011peaksAvailable

4、intand(v)canbewellfittedbyamodifiedCole–Coleapproach.Whenx=0.1,onlyonedielectriconline22August2011relaxationpeakisobserved,correspondingtodifferentoxygeniondiffusionprocesses,asdistinctfromtheonlyrelaxationpeakinthepureLa2Mo2O9.Therelaxationparameterst0,th

5、edielectricrelaxationKeywords:strengthD,andtheactivationenergyEawereobtained.Theresultofthisworkshowsthat,theA.OxidesconductivitychangecausedbydopingbetweenthetwophasesisduetothecombinationofthedipolarC.Impedancespectroscopyeffectsandmotionofions.D.Diele

6、ctricpropertiesD.ß2011ElsevierLtd.Allrightsreserved.DiffusionD.Ionicconductivity1.Introductionvacancies,whichwassimilartothedielectricdispersionbehaviorofLMO.Inthispaper,theLa2xSrxMo2O9d(x=0.05–0.2)ceramicsTheLa2Mo2O9(LMO)basedoxide-ionconductorshavewe

7、repreparedusingaconventionalsolid-statereaction.Theattractedgreatattentionssincetheirhighoxygen-ionconductivitydiffusedielectricanomaliesobservedintheseceramicsareatmediumtemperatureswasreported[1,2].TheywillbepotentialcharacterizedbythemodifiedDebyerelax

8、ationmodel,focusingapplicationsinsolidoxidefuelcells(SOFC),oxygensensors,mainlyonthefrequency-dependentfeatureofdielectricrelaxa-oxygenpumpsandoxygen-permeablemembranecatalysts.Thetion.Andtheeffectsofthesuppressedphasetran