VO_2的MIT特性及应用机理-豆柴文库

您所在位置：网站首页 / VO_2的MIT特性及应用机理.docx / 文档详情

在线预览结束，喜欢就下载吧，查找使用更方便

5 金币

下载文档

/ 2

下载提示

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

文本预览

VO_2的MIT特性及应用机理
Introduction:
V02,acompoundofvanadiumandoxygen,isawell-knownmaterialexhibitingMetaltoInsulatorTransition(MIT)characteristics.Thetransitionmechanismishighlyintriguing,asitinvolvesthealterationofthecrystallinestructureofthematerialduetotheeffectoftemperature,pressure,anddoping.Theapplicationofthismaterialinvariousfields,suchassensors,memorydevices,andswitches,hasgarneredattentionfromresearchersworldwide.ThispaperemphasizesunderstandingtheMITcharacteristicsofV02andexploringitsversatileapplications.
OverviewofV02:
V02belongstothegroupofcorrelatedelectronsystems(CES),whereelectronsinteractwitheachother,resultinginphysicalphenomenasuchasferromagnetismorsuperconductivity.TheuniquecesiumchloridestructureofV02makesitanidealcandidateforMIT.Initslow-temperaturemonoclinicphase,V02isaninsulatorandexhibitsantiferromagneticproperties.Ataround68°C,V02undergoesanMITandtransformsintothemetallicrutilephase.Thetransitioninvolvesanabruptshiftfromalowresistance,insulatingstatetoahighresistance,conductivestate.
MITCharacteristics:
Thetemperature-inducedtransitionfromtheinsulatingmonoclinicphasetotheconductingrutilephaseofV02isthehallmarkofMIT.TheMITofV02canbeattributedtoanelectronicphasetransition,whichinvolvesasignificantshiftinthepositionoftheFermilevel.Intheinsulatorphase,theFermilevellieswithintheenergygapbetweenthevalenceandconductionbands,signalingnoelectronactivity.TheheatingofV02beyondacertainthresholdtemperaturecausestheenergygaptoclose,allowingelectronstobecomemobileandgraduallyconductive.
Apartfromtemperatureandpressure,dopingandelectricfieldeffectsalsoinfluencetheMITpropertiesofV02.DopingwithtungstenandmolybdenumatomsinV02reducesthetemperatureatwhichthetransitionoccurs,whileironandtitaniumdopingenhancesthetransition.TheexternalelectricfieldinducesstresswithintheV02crystallattice,resultinginthetransitionunderlowercriticaltemperatures.
Applications:
TheMITcharacteristicsofV02makeitapromisingmaterialforavarietyofapplications.SomeofthesignificantapplicationsofV02ar