简介:采用均匀共沉淀法制备了荧光黄含量不同的一组荧光水滑石(MgAl-LDHs—C20H12O5),研究了其晶体结构、外观形貌、荧光性能、表面官能团及热稳定性。X射线衍射(XRD)图谱显示少量荧光黄的加入没有影响水滑石的结晶性能,荧光水滑石具有典型的水滑石特征峰;扫描电镜(SEM)图片显示采用均匀共沉淀法制备的荧光水滑石是片层状结构,荧光黄均匀地吸附在水滑石片层表面;荧光水滑石样品在470nm波长光激发下的荧光发射光谱(PL)显示荧光水滑石在500-600nin间出现了1个黄光发射峰,其荧光强度与其中荧光黄的含量有关,荧光黄的含量要适中,过高或过低均影响样品的荧光性能;热重分析(TG)曲线表明荧光类水滑石的热稳定性比纯荧光黄提高很多;红外光谱(IR)显示荧光水滑石含有水滑石和荧光黄的特征官能团。
简介:第三产生同步加速器X光象自然材料一样为许多设计材料的微结构描述提供一个崭新的机会。这篇文章为结构的材料的学习表明三种技术的用法:微分孔的X光检查显微镜学(DAXM),三维的X光检查衍射(第3DX),和散布的同时的宽angle/small角度X光检查(蜡/萨克斯风管)。DAXM能与高空间、尖的分辨率在多晶的材料测量3D谷物结构。在使变形的材料,streaked衍射山峰能被用来在单个谷物分析本地脱臼内容。比作DAXM,第3DX能大批印射谷物材料更快速在损坏空间分辨率的情况下。当材料在变丑下面时,发展微观结构,为学习是很有用的。蜡/萨克斯风管对与不同类的结构学习材料合适,例如猛抛加强的合金。蜡和萨克斯风管揭示的结构的信息能为更深的卓见被合为材料行为。这三种技术的未来开发和应用程序将也被讨论。
简介:Intrinsiccarrierconcentration(ni)isoneofthemostimportantphysicalparametersforunderstandingthephysicsofstrainedSiandSi1-xGexmaterialsaswellasforevaluatingtheelectricalpropertiesofSi-basedstraineddevices.Uptonow,thereportonquantitativeresultsofintrinsiccarrierconcentrationinstrainedSiandSi1-xGexmaterialshasbeenstilllacking.Inthispaper,byanalyzingthebandstructureofstrainedSiandSi1-xGexmaterials,boththeeffectivedensitiesofthestatenearthetopofvalencebandandthebottomofconductionband(NcandNv)at218,330and393KandtheintrinsiccarrierconcentrationrelatedtoGefraction(x)at300KweresystematicallystudiedwithintheframeworkofKPtheoryandsemiconductorphysics.ItisfoundthattheintrinsiccarrierconcentrationinstrainedSi(001)andSi1-xGex(001)and(101)materialsat300KincreasessignificantlywithincreasingGefraction(x),whichprovidesvaluablereferencestounderstandtheSibasedstraineddevicephysicsanddesign.
简介:利用溶剂热合成法成功制备出了形貌为准球形、棒形、球棒混合型和菱形,粒径在50nm以下、尺寸均一的锐钛矿型TiO2纳米晶,对合成出的纳米晶TiO2用荧光光谱,紫外/可见光吸收光谱进行光学性能表征,结果表明,TiO2纳米晶在330nm的激发光下,分别在345nm、363nm、380nm和402nm处存在4个发光峰位。在实验中,首次发现和证实了理论计算出的锐钛矿型TiO2纳米晶的两种直接跃迁发光,分别对应为X(1b)→X(2b)(345nm)和X(1b)→X(1a)(363nm),主要因为油酸改变了TiO2纳米晶的{001}晶面族晶面的表面态。TiO2纳米晶的紫外吸收峰位于229nm,且与其形貌无关;禁带宽度的计算值接近其理论值3.2eV。
简介:ThetransportpropertiesintheLa2/3(Ca1-xSrx)1/3MnO3(x=0,1/3,2/3)filmspreparedusingtheRFmagnetronsputteringmethodwereinvestigated.TheeffectoftheCa,Srdouble-dopingattheApositionintheLa2/3A1/3MnO3onthestructureofthetargetsandtransportofthefilmshasbeenstudied.Withtheincreaseofx,thestructuresofthetargetstransformfromtherhombohedralphasetothecubicphase;themetal-insulatorphasetransitiontemperature(Tp)ofthefilmsincreases;andthecorrespondingpeakresistivitydecreases.Allthephenomenacanbequalitativelyexplainedbythelatticeeffect.
简介:Inordertostudythestresscorrosioncracking(SCC)ofX70pipelinesteelanditsweldjointinacidsoilenvironmentofsoutheastofChina,twosimulatingmethodswereusedhere.Theonewastoobtainthebadmicrostructuresinheataffectedzonebyannealingat1300°Cfor10minandaircoolingtoroomtemperature,theotherwastogetaseriesofsimulatingsolutionsoftheacidsoilenvironment.SCCsusceptibilitiesofX70pipelinesteelsbeforeandafterbeingnormalizedinthesimulatedsolutionswerestudiedbyslowstrainratetest(SSRT)andmicrostructuralobservationoffractureareas.Potentiodynamicpolarizationcurveswereusedtostudytheelectrochemicalbehaviourofdifferentmicrostructures.SCCdoesoccurtoboththeas-receivedmaterialandnormalizedmicrostructureafterheattreatmentasthepolarizationpotentialdecreased.Hydrogenembrittlement(HE)isindicatedoccurringtoalltestedmaterialsat-850mV(vsSCE)and-1200mV(vsSCE).TheSCCmechanismsaredifferentwithinvaryingpotentialrange.Anodicdissolutionisthekeycauseaspolarizationpotentialhigherthannullcurrentpotential,andHEwillplayamoreimportantroleaspolarizationpotentiallowerthanthenullcurrentpotential.