简介:ThedosimetricphosphorsLi_3PO_4:M(M=Tb,Cu)wereproducedbymodifiedsolid-statemethod.ThestructuralandmorphologicalcharacterizationwascarriedoutthroughX-raydiffraction(XRD)andscanningelectronmicroscope(SEM).Additionally,thephotoluminescence(PL),thermoluminescence(TL)andopticallystimulatedluminescence(OSL)propertiesofpowderLi_3PO_4dopedwithTbandCuwerestudied.ItisadvocatedthatLi_3PO_4:CuphosphornotonlyshowshigherOSLsensitivity(25timesormore)butalsogivesfasterdecayinOSLsignalsthanthatofLi_3PO_4:Tb~(3+)phosphor.Theminimumdetectabledose(MDD)ofLi_3PO_4:M(M=Tb,Cu)phosphorsisfoundtobe21.69×10~(-3)and3.33×10~(-6)J·kg~(-1),respectively.InOSLmode,phosphorshowslineardoseresponseintherangeof0.02-20.00J·kg~(-1).InTLmode,sensitivityofLi_3PO_4:CuphosphorismorethanthatofLi_3PO_4:Tbphosphor.Thekineticsparameterssuchasactivationenergyandfrequencyfactorsweredeterminedbypeakshapemethod,andphotoionizationcrosssectionsofpreparedphosphorwerecalculated.
简介:BondingofAl2O3tocuisperformeddirectlyusingTifoilattemperatureof1273K.Themicrostructureofthejointinterfaceisinuestigatedthroughscanningelectronmicroscope(SEM),electron.probemicroanalysis(EPMA)andX-raydiffraction(XRD).theeffectoftheinitialtifoilthicknessonthereactionlayerthicknessandthejointStrengthareinvestigated.
简介:金属钛将开创21世纪的冶金工业的新纪元,钛及钛的化合物与人类生活有密切的关系,其以独特魅力征服人类。科学家们预言:21世纪将是钛的世纪。
简介:WereportanenhancementcavityforfemtosecondTi:sapphirelaserattherepetitionrateof170MHz.Anenhancementfactorof24isobtainedwhentheinjectingpulseshaveanaveragepowerof1Wandapulsedurationof80fs.ByplacingaBBOcrystalatthefocusofthecavity,weobtaina392-mWintracavitydoubled-frequencylaser,correspondingtoaconversionefficiencyof43%.Theoutputpowerhasalong-termstabilitywitharootmeansquare(RMS)of0.036%.
简介:Extractionoftitanium(Ⅳ)fromrealchlorideleachliquorofilmenitewascarriedoutwith0.1molL~(-1)di-(2-ethylhexyl)phosphoricacid(HDEHP)inkerosene.EquilibriumandkineticsstudiesforTi(Ⅳ)werecarriedoutinthepresenceofimpuritiesthatwereleachedwithTi(Ⅳ).ParametersaffectingextractionrateofTi(Ⅳ)fromchloridemediainthepresenceofFe(Ⅲ),Mg(Ⅱ),andAl(Ⅲ)werestudiedtoevaluatethestoichiometryofextractedTi(Ⅳ)species.ItisfoundthattheextractionrateofTi(Ⅳ)isdependentontheextractantconcentrationandpHofsolution.Undertheoptimumconditions,morethan95%Ti(Ⅳ)canbeextracted.Onthebasisofslopeanalysismethod,theextractedspeciesofTi(Ⅳ)appearstobe[TiO(H_2A_2)_2]_(org),whereH_2A_2referstoHDEHP.Further,thekineticstudiesoftheextractionprocessofTi(Ⅳ)andothermetalionimpuritieswerecarriedoutbyaLewiscellwithaconstantinterfacialareaof16.7cm~2.AnalysisoftheexperimentalresultssuggeststhatTiO~(2+)extractionratebyHDEHPisthefirstwithrespecttohydrogenionconcentrationandHDEHPconcentration.Theresultsareinterpretedbyareactionmechanismwheretheextractionprocessiscontrolledbyadiffusionprocessattheinterfaceratherthaninthebulkphase.