Microstructures and Microwave Dielectric Characteristics of英文

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1、journalJ.Am.Ceram.Soc.,87[12]2208–2212(2004)MicrostructuresandMicrowaveDielectricCharacteristicsofCa(Zn1/3Nb2/3)O3ComplexPerovskiteCeramics,†‡§X.M.Chen,*D.Liu,R.Z.Hou,X.Hu,andX.Q.LiuDepartmentofMaterialsScienceandEngineering,ZhejiangUniversity,Hangzhou310027,ChinaCa(Zn1/3Nb2/3)O3microw

2、avedielectricceramicswerepre-II.ExperimentalProceduresparedusingasolid-statereactionprocess,andtheirmicrowavedielectricpropertieswereevaluatedasfunctionsofsinteringCa(Zn1/3Nb2/3)O3powderswerepreparedusingasolid-stateandpostdensificationannealingconditions.Therelationshipreactionprocess

3、,wherereagent-gradeCaCO3(99%),ZnObetweenmicrowavedielectricpropertiesandprocessingwas(99.5%),andNb2O5(99.99%)powderswereadoptedastherawinterpretedthroughthevariationofmicrostructures.Thematerials.Theweighedrawmaterialswereball-milledwithdielectricconstantshowedslightvariationwithsinter

4、ingandzirconiamediaindistilledwaterfor24h,andthemixtureswereannealingconditions,buttheQ
fvalueincreasedatfirstandheatedat1000°,1150°,and1250°Cinairfor3haftertheyweredried.Thecalcinedpowderswith8wt%ofpoly(vinylalcohol)thendecreasedwithincreasedsinteringtemperature,and(PVA)werepressedint

5、odisksthatmeasured12mmindiameterannealinginoxygenindicatedsignificantimprovementinQ
f,and2–6mminheightandthensinteredat1100°–1350°Cinairforespeciallyforthespecimenssinteredathighertemperatures.3h.AftertheywerecooledfromthesinteringtemperaturetoThegoodmicrowavedielectricpropertieswereob

6、tainedinthe1000°Catarateof2°C/min,theceramicswerefurthercooledceramicssinteredat1225°Cinairfor3handannealedatwithinthefurnace.Someofthespecimensformicrowavecharac-1100°Cinoxygenfor8h:34.1,Q
f15890GHz,foterizationwereannealedat1100°Cinoxygenfor8h.48ppm/C.Thebulkdensityofthespecime

7、nswithregularshapewerecalculatedusingdimensionsandweight.Afterthesinteredspeci-menswerecrushedandground,theircrystalphasesweredeter-I.IntroductionminedusingpowderX-raydiffractometry(XRD)withCuKradiation.TheXRDdataforRietveldanalysiswerecollectedoverCOMPLEXperovskiteoxides,suchasBa(Z