XRD射线衍射分析方法.pdf

《XRD射线衍射分析方法.pdf》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、XRDAPPLICATIONNOTEPairdistributionfunctionanalysisTotalscatteringexperimentsusinghigh-energyX-raysonalaboratorysystemIntroductionRecentyearshaveshownanincreasedSummaryinterestinthestudyofnanocrystallineAnalyzingpowderdiffractiondatamaterialsduetotheirspecificp

2、ropertiesofnanocrystallineandamorphousforapplicationine.g.semiconductors,materialsusingtheatomicpairpharmaceuticalsandpolymers.distributionfunction(PDF)methodStructuralinformationabouttheseprovidesusefulinformationaboutmaterialsispresentasbroad,notwellthelong-

3、andshort-rangeorderingdefinedfeaturesinadiffractogram.oftheatomsinthematerials.WeAnalysisofnanomaterialsthereforehavedevelopedtheapplicationrequiresatotalscatteringapproach,ofPDFanalysisonastandardincludingbothBraggpeaksanddiffuselaboratorysystememployingansca

4、ttering.Oneofthemostpromising(a)X-raytubewitheitherasilveroraanalyticalmethodsusedisatomicpairmolybdenumanodeasX-raysource.distributionfunction(PDF)analysis.DataobtainedfromavarietyofOriginally,thismethodwasusedto]samplesareshown.Meaningful-2resultshavebeenach

5、ieved,thatstudyprimarilyamorphousandhighlydisorderedmaterials.Morerecently,G[Åallowedextractingstructuralithasbeenusedfortheanalysisofinformationforcomparisonwithnanostructuredmaterials.Sincethedatareportedinliterature.methodrequiresshortwavelengthstoobtainhig

6、hresolutioninrealspace(welldefinedinteratomicdistances),oftenthemeasurementsareperformed(b)atsynchrotronfacilities,makinguseof0123456boththehighphotonenergiesandther[Å]highphotonfluxthatthesefacilitiesoffer.SchematicrepresentationoftheconstructionWehaveinvesti

7、gatedthepossibilitytooftheatomicpairdistributionfunctionfromaapplythepairdistributiontechniquesquarearrayofatoms[2].Thecoloredcircles(a)onanin-housesystem,usingAgorindicatethedistancefromacentralatomwhereMoKαradiation.Thisapplicationnoteaneighboringatomcanbefo

8、und.Thearrowsindicatethecorrespondingpeaksinthepairdescribestypicalresultsonnanocrystals,distributionfunction.liquidsandamorphousmaterials.TheAnalyticalX-rayCompanyPairdistribution