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简介：在不同温度下对用金属锰法制得Ｍｎ３Ｏ４粉末和含有部分Ｍｎ（ＯＨ）２的Ｍｎ３Ｏ４粉末分别进行除气处理，然后用静态氮吸附法对其进行对比实验，测试其在各自温度处理后的比表面积。结果表明，在金属锰法制取高纯Ｍｎ３Ｏ４粉末时，应使部分Ｍｎ（ＯＨ）２保留下来，然后对其进行高温（如２００℃）处理，这样可以大大提高高Ｍｎ３Ｏ４粉末的比表面积。

简介：VariousaffectingfactorsanddegradationmechanismwerestudiedonultrasonicdegradationofmethylorangeadoptingY2O3dopinganataseTiO2catalystpreparedinlaboratory.Intheexperiment,theUV-VISspectrophotometerwasusedtofollowandinspectthedegradationprocessofmethylorange.TheresultsindicatethattheultrasonicdegradationratiosofmethylorangeinthepresenceofanataseTiO2catalystaremuchbetterthanthosewithoutcatalyst.Moreover,thecatalyticperformanceofY2O3dopinganataseTiO2catalystisobviouslyhigherthanthatofanataseTiO2catalystwithoutdoping.TheoptimalconditionswereadoptedinthisworkandthedegradationandCODeliminationratioofmethylorangegotto98%and99.0%in90min,respectively.

简介：建立了碱熔水浸的方法溶解试样,ICP-AES法同时测定钛铁矿中硅和铝的方法,对分析过程中的一些条件进行了研究,该法用于测定钛铁矿中SiO2和Al2O3,得到了满意的结果,相对标准偏差为3.00%~5.04%,回收率在96.5%~103.8%之间。

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简介：本文采用高温团相反应合成TCaTiO3∶Pr3+红色发光材料、报道了Pr3+激活的CaTiO3的光谱特征及长余辉特性，并与CaS∶Eu的光谱特性及长余辉进行了比较。CaTiO3∶Pr3+将是一种具有广泛用途的新材料

简介：介绍了武山铜矿中段运输系统原3m3底侧卸矿车的设计特点。结合生产实际状况，对3m3底侧卸矿车在运行过程中出现的问题进行了分析，总结产生故障的原因，针对性的提出改进措施。现场使用表明，通过改进后，取得了良好效果，满足了矿山生产的需要。

简介：Eu3+activatedSr1–xEuxZrO3(x=0.01–0.04)phosphorwithperovskitestructurewassuccessfullysynthesizedbyusingcombustionmethod.Thestructure,morphologyandopticalpropertiesofthematerialwerecharacterizedbyX-raydiffraction,scanningelectronmicroscopyandfluorescencespectrometry.TheXRDresultsindicatedthatcrystalsofSrZrO3:Eu3+belongstotetragonalperovskitesystem.ThephosphorcouldbeeffectivelyexcitedbyUVlightandtheemissionspectraresultsindicatedthatreddish-orangeluminescenceofSrZrO3:Eu3+duetomagneticdipoletransition5D0→7F1at593nmwasdominant.Thus,thepreparedphosphorshowedremarkableluminescentpropertieswhichfindapplicationsinfieldemissiondisplay(FED)andplasmadisplaypanel(PDP)devices.

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简介：Calciumtitanatedopedwithpraseodymiumwaspreparedthroughsolidstatereactionanditexhibitedintenseredemissionat612nm.Phosphorswerecharacterizedforphotoluminescence,thermo-luminescenceandafterglowemissions.Studyofeffectsofrareearthsonphotoluminescenceaswellasafterglowintensitywasreported.Presenceofgadoliniumenhancedluminescence.Presenceofsomemonovalentionsenhancedbothafterglowandphotoluminescenceemission.Thermo-luminescenceglowcurveswereanalyzedand...

简介：AseriesofCe0.5Fe0.30Zr0.20O2catalystswerepreparedbydifferentmethods(co-precipitationsmethod,citricacidsol-gelmethod,impregnationmethod,physicalmixedmethod,andhydrothermalmethod)andcharacterizedbyX-raydiffraction(XRD),Ramanspectroscopy,Brunauer-Emmett-Teller(BET)andH2-TPRmeasurements.Potentialofthecatalystsinthesootoxidationwasevaluatedinatemperature-programmedoxidation(TPO)apparatus.TheresultsshowedthatalltheFe3+andZr4+wereincorporatedintocerialatticetoformapureCe-Fe-Zr-Osolidsolutionfortheco-precipitationsample,buttwokindsofFephasesexistedintheCe-Fe-Zr-Ocatalystspreparedbyothermethods:Fe3+incorporatedintoCeO2latticeanddispersedFe2O3clusters.ThefreeFe2O3clusterscouldimprovetheactivityofcatalystsforsootoxidationcomparingwiththepureCe-Fe-Zr-OsolidsolutionowingtothesynergeticeffectbetweenfreeFe2O3andsurfaceoxygenvacancies.Inaddition,theactivityofcatalystsstronglyreliedonthesurfacereducibilityoffreeFe2O3particles.HoldingbothabundantfreeFe2O3particlesandhighoxygenvacancyconcentration,thehydrothermalCe0.5Fe0.3Zr0.2O2catalystpresentedthelowestTi(251°C,ignitiontemperatureofsootoxidation)andTm(310°C,maximumoxidationratetemperature)forsootcombustion(withtight-contactbetweensootandcatalysts)amongthefivesamples.Evenafteragingat800°Cfor10h,theTiandTmwerestillrelativelylow,at273and361°C,respectively,indicatinghighcatalyticstability.

简介：TheeuropiumionsdopedMMoO_4(M=Sr,Ba)nanophosphorsweresuccessfullysynthesizedviaafacilehydrothermalmethodusingisopropanol.Therelationshipbetweenphosphorcrystallinephase,morphology,photoluminescentpropertiesandhexadecyltrimethylammoniumbromide(CTAB)concentration,pHvalueinprecursorsolutionwasinvestigated.TheresultsindicatedthatthemorphologyandphotoluminescentpropertieswerestronglyinfluencedbyCTABconcentrationandpHvalueinprecursorsolution.InSrMoO_4:Eu~(3+)hosts,thephosphorsurfacetendedtobecomesmootherastheconcentrationofCTABwasincreased;whileparticlestendedtoagglomerateasincreasingpHvalue.TherelativeintensityratioofchargetransferbandtoEu~(3+)characteristicemissionpeaksofMMoO_4:Eu~(3+)(M=Sr,Ba)waschangedasCTABconcentrationandpHvaluechanged.TheemissionspectraofMMoO_4:Eu~(3+)(M=Sr,Ba)couldbeadjustedbyCTABconcentrationandpHvalueduetotheirimpactsonthestructure.ItwasimportantthatthedifferentmorphologiesandphotoluminescentpropertiesofMMoO_4:Eu~(3+)(M=Sr,Ba)couldbeobtainedbythefacilehydrothermalmethodandmodulatedbychangingCTABconcentrationandpHvalue.

简介：Glasseswiththecompositionof65GeO212Ga2O3-10BaO-8Li2O-5La2O3(molarratio)dopedwith1.526wt.%,3.006wt.%,5.836wt.%,11.028wt.%,and15.678wt.%Tm2O3,respectively,werefabricatedbyconventionalmeltingmethod.AccordingtotheabsorptionspectraandtheJudd-Ofelttheory,theJ-Ostrengthparameters(Ω2,Ω4,Ω6)werecalculated,withwhichtheradiativetransitionprobabilities,branchingratiosandradiativelifetimeswereobtained.Theinfraredemissionspectra(with808nmLDexcitation)at～1.47and～1.8μmofvariousconcentrationsofTm3+-dopedglasseswerestudied.Theemissionintensityat～1.8μmreachedtothemaximumwhentheTm2O3-dopingconcentrationwasneartobe～3.006wt.%(1.0mol.%),andthendecreasedasdopingconcentrationincreasedfurther.Themechanismofthefluorescenceintensitychangewasexplainedwiththecross-relaxationeffectandtheconcentrationquenchingeffectofTm3+.Meanwhile,accordingtoMcCumbertheory,theabsorptionandemissioncross-sectionscorrespondingtothe3F4→3H6transitionsofTm3+at1.8μmwasobtained.ForTm3+-dopedgermanateglasses,themaximumemissioncross-sectionreachedavaluehigherthanthatre-portedforfluorozircoaluminateglasses.Itisexpectedtobeafavorablecandidatehostfor～2.0μmmid-inflatedlaserbecausetheglassshowsfavorableopticalspectra.

简介：ＥｌｅｃｔｒｏｎＭｉｃｒｏｓｃｏｐｉｃＩｎ－ｓｉｔｕＯｂｓｅｒｖａｔｉｏｎｆｏｒＰｒｅｐａｒａｔｉｏｎｏｆＵｌｔｒａｆｉｎｅＬａ２Ｏ３ＮａｎｏｐｈａｓｅＰｏｗｄｅｒＧａｏＹｕｚｕｎ（高愈尊），ＬｉＹｏｎｇｈｏｎｇ（李永洪），ＺｈａｎｇＴａｉｓｏｎｇ...

简介：Whitelight-emittingYVO_4：1mol.%Dy~（3＋）,xmol.%Eu~（3＋）phosphorpowderswithordermorphologyandwellcrystallizationwerehydrothermallysynthesizedat180°C.Themicrostructure,white-lightemission,andlight-emittingmechanismofthepowderswerecarefullystudiedusingX-raydiffractometry,scanningelectronmicroscopyandphotoluminescencespectra.TheexcitationandemissionspectraofthephosphorpowdersindicatedthecoexistenceofefficientenergytransferfromEu~（3＋）toDy~（3＋）andinefficientenergytransferfromDy~（3＋）toEu~（3＋）besidestheenergytransferfromVO_4~（3–）toEu~（3＋）.IncreasingtheEu~（~（3＋））concentrationinitiallyenhancedandthenweakenedtheluminescentintensityofDy~（3＋）.Thewhite-lightemissionsofYVO_4：1mol.%Dy~（3＋）,xmol.%Eu~（3＋）phosphorpowderswerebothrelatedtotheenergytransferbetweenVO_4~（3–）andDy~（3＋）/Eu~（3＋）,aswellasbetweenEu~（3＋）andDy~（3＋）.TheinefficientenergytransferfromDy~（3＋）toEu~（3＋）wasfirstfound.

简介：InordertosensitizetheluminescenceofEu3+ionsinheavymetalglass,zincleadborateglasssamplescontainingvariousconcentrationsofEu3+andTb3+ionswerepreparedtostudytheTb3+toEu3+non-radiativeenergytransferphenomena.EnergylevelstructuresofTb3+andEu3+ionswereplottedtoshowtheexcitationandenergytransferroutes.EfficientenergytransferfromTb3+toEu3+wasobservedandstudiedqualitativelyintermsofdopingconcentrations.Thesensitizationturnedouttobelesseffectivethanexpected.FurtherstudiestocharacterizetheoxidationofTb3+intotetravalentstateandtoexaminethemechanismofenergytransferareproposed.

简介：LongafterglowphotoluminescentmaterialsSr2MgSi2O7dopedwithEu2+,Dy3+werepreparedbysol-gelmethod.ThesynthesizedsampleswerecharacterizedbyX-raydiffraction.Theexcitationspectrum,emissionspectrumandlongdecaycurveweremeasuredandanalyzed.XRDpatternindicatesthatphosphoriswithSr2MgSi2O7crystalstructure.Thewiderangeofexcitationwavelengthindicatesthatluminescentmaterialcanbeexcitedbylightfromultravioletraytovisiblelight.Themainpeakofemissionspectrumislocatedat466nm.Sampleexcitedbyvisiblelightcanemitbrightbluelight,andtheafterglowtimelastsmorethan8h.

简介：ThemorphologyandcorrosionbehaviorofNi/Al2O3compositecoatingspreparedusingdouble-pulsedelectrodepositingtechniqueafteroxidizedunder800℃NaCldepositinairenvironmentwereanalyzedbyscanningelectricalmicroscope(SEM),X-raydiffraction(XRD)andenergydispersivespectrum(EDS).TheresultsshowedthatthecorrosionofallcompositecoatingswasacceleratedunderNaCldeposits,andthecorrosionproductswereratherporouswithpooradherencetothematrix.Al2O3particlesinthecoatingscanrefinethegrainsizeandimprovethehightemperaturecorrosionresistanceofthecoatings.Withinthetestscope,themoreAl2O3particlesinthecoatings,thelowercorrosionratescouldbeobtained,andthecorrosionmechanismwasalsodiscussed.

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简介：Cr的Nanopowder:Cr的GGG和nanopowder，Nd:有从0.1at.%到1.5at.%的Cr3+的不同集中的GGG被大音阶的第五音胶化方法用醋酸和乙烯乙二醇综合。热gravimetric分析和微分扫描热量测定(TGA-DSC)，X光检查衍射(XRD)和光致发光光谱学被用来描绘粉末。当在1000点对待时，雏晶尺寸是大约58nm?????????????????猯灵?匠?猼'T资???猼灵?????????猯'T??猼灵????￣?????猯'T????猯灵??猼'T?????吗????????????????‵渠????????浮？？