简介:以无水FeCl,和双硫腙为原料,通过溶剂热法得到分散均匀的棒状含铁前驱体,将该前驱体在400℃煅烧3h后制成管状氧化铁。X射线衍射仪(XRD)和环境扫描电镜(ESEM)的研究结果表明:所得管状氧化铁为六方相(α-Fe2O3,1的一维微米管,其平均直径约为2岬、长度约为10~20μm。傅立叶变换红外光谱仪(FT-IR)所测数据表明,该产物氧化铁表面吸附有部分SO42-离子;而紫外-可见光谱仪(uv-vis)的数据分析发现,其紫外最大吸收k。;约为489nm,带宽吸收约在566.2nm处,间接禁带宽度和直接禁带宽度分别为1.97eV和2.189eV,与文献报道值接近。
简介:Aconoscopicholography-based3Dmeasurementsystemforanalyzingthedefectsonthesurfaceofsteelplateswasintroducedinthispaper.Thehardware,whichisautomatedthroughsoftware,performssamplingofthesteelplatesurface.Throughthesoftwareinterface,point-clouddataofthesteelplatesurfaceareobtainedandreconstructedtoforma3Dimageofthesteelplatesurface.Thesoftwareallowsautomaticanalysisofsteelplatesurfacedefectsthroughidentificationofthebulgesanddepressions.Inaddition,thesoftwarecanalsoautomaticallycalculatethedefectinformation,suchasthedeepestpoint,volume,openingarea,openinglength,andsoon,therebydeterminingthedefectsize.Theresultsdeterminedbythis3Dmeasurementsystemwerefoundtobeingoodagreementwiththeactualvalues.
简介:Au/TbMnO3/YBa2Cu3O7-xcapacitorswerefabricatedonSrTiO3substratesbypulselaserdepositiontechnique,ofwhichelectricpropertieswereinvestigatedinthetemperaturerangefrom25to300K.Bothcurrent-voltagecharacteristicsandjunctionresistanceswithbiasvoltagesshowedremarkabletemperaturedependence,inwhichobviousthermallyexcitedrelaxationprocesseswerefoundbetween150and200K.Atthetemperatureslowerthantheactivationprocess,theleakagecurrentsofthecapacitorswerestudied.Interestingly,athighelectricfield,themechanismoftheleakagewasPoole-Frenkelemission.However,atlowelectricfield,theconductionwasnotOhmic,andideallnJ∝E1/4characteristicswereobserved.Analysisshowedthatthepossibleoriginwasrelatedtotheinherentinhomogeneousnatureofactivationlesspercolatingtransport.
简介:以硝酸铟为原料,用氨水做沉淀剂,采用水解沉淀-水热法制备In2O3的前驱体In(OH)3,用扫描电镜、X射线衍射仪及激光粒度分析仪对产物的结构、形貌和粒度进行表征。结果表明,水解沉淀产物为立方相In(OH)3,呈短棒状团聚体。水热处理过程中,产物的晶型、形貌和粒度受Ostwald熟化机制和相转化机制的影响。当水热温度低于280℃时,首先发生Ostwald熟化机制,In(OH)3颗粒形貌由短棒状转变为长方体,而物相不发生变化。当水热温度高于280℃时,除发生Ostwald熟化机制外,还存在相转化机制,产物形貌先由棒状转变为长方体,接着转变为多面体,且物相由立方相的In(OH),转变为斜方相的InOOH。