简介:黄磷(Bi1-xSmx)2ZnB2O7(x=0.01,0.03,0.05,0.07,和0.09)被常规稳固的州的反应综合。所有样品的纯净被X光检查粉末衍射(XRD)检查。XRD分析证明所有这些混合物具有Bi2ZnB2O7的一个单个阶段,显示在Bi2ZnB2O7的双性人(3+)能被没有晶体结构的变化的Sm(3+)部分代替。在房间温度的刺激和排放系列显示出Sm(3+)的典型4f-4f转变。主导的刺激线在404nm附近由于(6)H5/2→(4)K11/2和排放光谱在563,599,646,和704nm由一系列线组成由于(4)G5/2→(6)H5/2,(6)H7/2,(6)H9/2,并且(6)H11/2分别地。在Bi2ZnB2O7的Sm(3+)的最佳的集中关于3mol%(相对1mol双性人(3+))并且批评距离Rc作为2.1nm被计算。Bi1.94Sm0.06ZnB2O7的排放紧张的温度依赖在在100和450K之间的温度范围被检验。紧张下降了到起始的紧张的一半的熄灭的温度是280K。为在Bi1.94Sm0.06ZnB2O7的Sm(3+)的一生作为0.29和1.03ms的价值被适合。
简介:BulknanocrystallineSmCo6FesinteredmagnetwaspreparedbySparkPlasmaSinteringtechnique(SPS).XRDpatternsshowthatthemagnetexhibitsastableTbCu7structure.TEMobservationindicatesthatthemicrostructureofthemagnetiscomposedofSmCo6Fesinglephasegrainswithanaveragegrainsizeof30nm.Magneticmeasurementshowsthatunder9Tmagneticfield,thecoercivityofthemagnetreaches1.12T;thesaturationmagnetizationandtheremanenceare1.13and0.67T,respectively.Themagnethasa(BH)maxof75.6kJ·cm-3.
简介:本文详细介绍了江铜贵冶卡尔多炉西门子PCS7过程控制系统的应用情况及主、辅控制系统的技术改造,分析了西门子中英版本PCS7系统的合并过程中存在的问题,以及西门子不同系列控制系统之间的网络通讯问题,并给出了符合现场工艺要求的解决方案。
简介:ThecompoundSm0.98Fe9.02–xGaxNδ(x=0,0.25,0.5,0.75,1)werepreparedbymelt-spunmethodandsubsequentannealingandnitriding.TheRietveldanalysisshowedthatthelatticeexpansionplayedanimportantroleinimprovingtheCurietemperature.AnobviousdevelopmentoftheCurietemperaturewasobtainedwiththeincreasedGacontentfromx=0–1(ΔTc=90oC).Theoptimumcoercivityofnitrideswasobtainedatx=0.25withthevalueHcj=652kA/m(8.15kOe)afterannealing,whichcorrespondedtoareasonabledistributionofgrainsizesofbothTbCu7-typeSmFe9Nδandα-Fe.However,anexcessofGadopingmightleadtoanabnormalgrowthofα-Fe,whichinturndeterioratedthemagneticproperties.ItwasconcludedthatamoderateGacontentwasveryeffectiveinraisingthecoercivityandCurietemperamentintheTbCu7-typeSm-Fe-N.
简介:Differentrareearth(RE)ionsdopantswereaddedintotheSrAl2SiO7:Eu2+phosphorsinordertoenhancethephosphorescenceproperties,andtheeffectoftheREionsincludingYb3+,Ce3+,Nd3+,Dy3+andTm3+,wascomparativelyinvestigated.ItwasfoundthatNd3+additionimprovedthephosphorescencepropertiesobviouslyamongallthestudiedREions.Therefore,Sr1.96–xAl2SiO7:xEu2+,yNd3+phosphorswerestudiedindetail,andtheoptimumEu2+andNd3+concentrationsweredeterminedwiththeafterglowtimeofabout20min.Thephasestructures,photoluminescence(PL)properties,long-lastingphosphorescence(LLP)properties,afterglowdecaycurvesandthermo-luminescence(TL)fortheselectedphosphorsduringthecorrespondingstudywereinvestigated.AllthephosphorsexhibitedgreenPLemissionandLLPemission.ThereweretwoTLbandslocatedatabout325and380Kforthestudiedsamples,andtherelationshipbetweenREadditionandphosphorescencepropertieswasdiscussed.
简介:FluorescencespectraofSm2+andEu2+→Sm2+energytransferwerestudiedinSrB4O7.Thereappearsonlyfluorescencefrom5D0transitionofSm2+at77K.Thevibroniclinesassociatedwith5D0→7F0transitionwereobserved.Thethermalpopulationtoupperstatesof5D1and4f5dlevelsfrom5D0givesriseto5D1→7FJand5d→4fradiativetransitionsofSin2+athighertemperature.
简介:Eu2+andDy3+codoped(Ca,Sr)7(SiO3)6Cl2yellowphosphorsweresuccessfullysynthesizedbyself-fluxmethod.Thestructure,morphologyandphotoluminescencepropertieswereinvestigatedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM)andphotoluminescencespectra.Theas-preparedphosphorshowedabroademissionspectrumcenteredat550nmforEu2+single-dopedphosphor,whilelocatedat548–544nmfortheEu2+,Dy3+codopedsamplesunderexcitationat380nmlight.TheemissionintensitywasgreatlyimprovedwhenDy3+wasdopedintothe(Ca,Sr)7(SiO3)6Cl2:Eu2+system.Thecomposition-optimizedsamplewith3mol.%ofDy3+andconstant10mol.%ofEu2+exhibiteda220%PLenhancementcomparedtothephosphorwith10mol.%Eu2+single-doped.Meanwhile,itwasfoundthatthequantumefficiencyofphosphornamely(Ca,Sr)7(SiO3)6Cl2:3mol.%Dy3+,10mol.%Eu2+couldgetupto24.6%.Thesynthesizedyellow-emitting(Ca,Sr)7(SiO3)6Cl2:Dy3+,Eu2+isapromisingcandidateashigh-efficiencyyellowphosphorforNUV-excitedwhiteLEDs.
简介:15%Ag-addedcubicperovskitesSr0.9La0.1TiO3andRuddlesden-Popper(RP)phasesSr2.7La0.3Ti2O7werefabricatedviahydrothermalsynthesis,coldpressingandhigh-temperaturesintering.Thestructureandthermoelectricpropertieswerealsoinvestigatedforallsamples.TheresultsindicatedthatAgprecipitatedasasecondphase.AgadditionmadeelectricalconductivityandabsoluteSeebeckcoefficientenhanced,asaresult,theZTvalueswereenhancedbothfortwoseries.Comparedwithcubicperovskite,RPphasewassubjectedtosmallerimpactbyAgaddition.ThereasonsforenhancingZTvalueandthedifferentimpactfortwoseriesbyAgadditionwerealsodiscussed.
简介:LongafterglowphotoluminescentmaterialsSr2MgSi2O7dopedwithEu2+,Dy3+werepreparedbysol-gelmethod.ThesynthesizedsampleswerecharacterizedbyX-raydiffraction.Theexcitationspectrum,emissionspectrumandlongdecaycurveweremeasuredandanalyzed.XRDpatternindicatesthatphosphoriswithSr2MgSi2O7crystalstructure.Thewiderangeofexcitationwavelengthindicatesthatluminescentmaterialcanbeexcitedbylightfromultravioletraytovisiblelight.Themainpeakofemissionspectrumislocatedat466nm.Sampleexcitedbyvisiblelightcanemitbrightbluelight,andtheafterglowtimelastsmorethan8h.