简介：ThephaseandmorphologytransformationduringthehydrothermaltreatingprocessofY2O3wasevaluatedwithX-raydiffcrcnce(XRD),scanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM),particlesizeandspecificsurfaceareadetermination.TheresultsshowedthatthecubicY2O3didnottransferintohexagonalY(OH)3inpurewater.Therefore,purehexagonalY(OH)3withnanotubeandmicrorodmorphologieswereobtainedbyhydrothermaltreatingY2O3at150℃for12hin15mlof2mol/LNaOHsolutionwithandwith-outPVAorPEGItwassuggestedthatthecharacteristicpreferentialgrowthofY(OH)3wasattributedtothestructureanisotropyofhexahedronY(OH)3.TheadditionofPVAorPEGcouldpromotetheformingprocessofnanotubesbyselectiveadsorptionondifferentcrystalplanes,whichalteredthegrowthratealongdifferentdirectionsandresultedinthediffusionlimitofconstructingionsinthecentertopofrods.Finally,Y(OH)3:EuandY2O3:Eunanotubeswerealsosynthesizedbyusingthismethod,andtheirphotoluminescencepropertieswereevaluated.

简介：Inthepasttenyearstheeomplementarytristimulusspeetrophotometryll],eTs,hasseenitsdiverseappli-eations{2一61thoughmostresearehesremaininrelativelysimpesystems,andlessworkhasbeeninvolvinkinetiereaetions.AnattemPthasbeenmadeontheinvestigationofsomecomPlieatedsystemseontainingrareearthsandmeta一acetylchloroPhosPhonaz

简介：作为报导Y2O2S的改进:Tb3+，白光的长持续的黄磷：Y2O2S:Tb3+，Sm3+被准备由固态反应。光致发光系列证明在紫外刺激下面的Tb3+和Sm3+排出物的位置和形状在这位主人是类似的，它在不同刺激下面保证了一种稳定的白排放颜色(IEC的日光标准)。共同做的样品的腐烂曲线显示二个离子的排出物的腐烂时间是靠近的。热照明测量建议做的Sm3+离子创造的陷井是有用的推迟共同做的样品的白晚霞。因此，共同做的Sm3+离子的功能作为改进样品的白排放颜色并且充当新陷井中心被证实。

简介：

简介：Whitebody-color(Y,Gd)BxV1-xO4-x:Eu3+phosphorswerepreparedbycoprecipitationreaction.UnderVUVexcitationat147nm,theredemissioncolorimetricpurityof(Y,Gd)BxV1-xO4-x:Eu3+phosphorismuchbetterthanthatofcommercialPDP(plasmadisplaypanels)phosphor(Y,Gd)BO3:Eu3+.Butitsrelativeemissionintensityisonlyabout90%ofthecommercialphosphor.

简介：ＳｔｕｄｙｏｎＭｏｒｐｈｏｌｏｇｙｏｆＳｕｒｆａｃｅｏｆＬａｒｇｅＡｒｅａＹＢＣＯＴｈｉｎＦｉｌｍｓｏｎＺｒ（Ｙ）Ｏ２ＳｕｂｓｔｒａｔｅＷａｎｇＲｕｉｋｕｎ（王瑞坤），ＳｕｎＬｉｈｏｎｇ（孙丽虹），ＬｉｕＨｏｎｇｆｅｉ（刘鸿飞）ＷａｎｇＸｉａｏｐｉ?..

简介：Thenanosizedparticlematerialsofdoped-TiO2withY2O3werepreparedbymeansofsol-geltechniqueforuseinelectrorheological(ER)fluids,andtheircrystalstructuresweremeasuredbyX-raydiffraction(XRD)analysis.TocomparewiththepureTiO2,adistinctenhancementintheshearstressunderdcelectricfieldwasfoundbyusingsuchmaterials.Thiscanbeexplainedbytheincreaseofthedielectriclossanddielectricconstantatlowfrequency.TheeffectsofthecrystalstructureoftheparticlesonthedielectricpropertyandERperformanceofmaterialswereinvestigated.

简介：Redphosphor(Y,Gd)BO3:Eu3+withgrainshape,smallsize,non-agglomerate,highcrystallinityandgoodphotoluminescence(PL)intensitywaspreparedbyacomplexmethodthattheprecursorofthephosphorwaspreparedbyco-precipitationmethodandthephosphorwaspreparedbycombustionmethod.TheSEMphotosandthephotoluminescencespectrumexcitedunderVUVshowthatthemorphologyandluminescentpropertiesofthisphosphoraresatisfiedwhenanappropriateamountofureawasadoptedasthecombustionagentinthepreparationprocedure.

简介：TheelectrodeprocessofY3+iononmolybdenumandnickelelectrodeshasbeenstudiedbycyclicvoltammetryandchronopotentiometryintheYCl3-NaCl-KClmelt.Theoverallchargetransferprocessisatwo-stepreaction:Y3++e=Y2+;Y2++2e=Y.YttriumreducedonthenickelelectrodecanformaseriesofNi-Yalloys.X-raydiffractionanalysiswasemployedtodeterminethealloycompositionsformedunderdifferentcon-ditions.

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

简介：EffectofCe-Mg-Si(lightRE)andY-Mg-Si(heavyRE)nodulizersonthemicrostructuresandmechanicalpropertiesofheavysectionductileironwasinvestigatedtodevelopthematerialofspent-nuclear-fuelcontainers.Twoas-castsweretreatedbythesamequalitypercentageoflightREandheavyRE,respectively.Fourpositionswerechosentostandfordifferentsolidificationcoolingratesofspecimens.Thetensilestrength,elongationandimpacttoughnessofspecimenstreatedbyheavyREwereallhigherthanthoseofthespecimenstreatedbylightRE.Withthedecreaseofcoolingrate,themechanicalpropertiesoftwospecimensdecreased,andthefracturemorphologychangedfromductilefracturetobrittlefracture.TheimprovingeffectofmechanicalpropertiesbetweenheavyREandlightREwasobviousduetothebetteranti-degradationpropertyofheavyRE.Whilethesolidificationprocesslastedformorethan250min,theimprovingeffectwasnotobviousduetoseriousspheroidalizationdecaying.

简介：TheZrO2-Al2O3ceramiccompositeswerepreparedbyappropriatetechniqueswithcommercialZrO2andAl2O3powdersasrawmaterialsandY2O3asstabilizer.TheresultsindicatethatwiththeintroductionofAl2O3intotheZrO2matrixwherethequantityofadditiveY2O3is3.5%(molefraction),thegrowthofZrO2grainsisefficientlyinhibited,whichhelpstheZrO2grainsexistinametastabletetragonalmanner;thushigherstrengthandtoughnessareacquired.Whenthecontentofaluminais20%(massfraction),thebendingstrengthandfracturetoughnessofthecompositesare676.7MPaand10MPa·m1/2respectively,themechanicalbehaviorsareclosetothosepreparedwithZrO2andAl2O3powderssynthesizedthroughwetchemicalapproach.Themechanicalbehaviorsofthecompositesarewellimprovedowingtothedispersiontougheningofaluminagrainsandphasetransformationtougheningofzirconiagrains.

简介：

简介：文章研究了对Mg-9Gd-4Y-0．6Zr合金在时效过程中的微观组织。在225℃时效初期硬度缓慢上升，之后硬度急剧上升，24h出现了明显的时效硬化峰，然后硬度开始下降。微观结构的分析结果表明，在初期（2h）产生了大量弥散分布的具有DO19结构的β″，而在峰值时（24h）出现具有bco的β′，在持续时效（384h）时出现亚稳相β1，而在后来的长时间时效（1000h）时出现既在原位转变的平衡相β。

简介：做Gd或做Lu的长晚霞红黄磷Y2O2S:Sm(3+)用高温度流动熔化方法被综合。获得的黄磷用X光检查衍射被分析决定晶体结构，并且阶段分析产品在单个阶段的表演。光系列和腐烂曲线在一个日立F-4500荧光分光光度计上被测量。腐烂时间在一个ST-900PM弱轻光度计上被决定。分析证明陆做的那位主人改进材料的光和腐烂时间。做的陆和Sm的集中被改变以便决定最佳的条件并且综合有最好的性质的产品。长晚霞的机制简短也被讨论。

简介：AseriesofSm~(3+)dopedY_2MoO_6werepreparedthroughhightemperaturesolidstatereactiontechnique.Theirphasestructures,morphologiesandluminescencepropertieswereinvestigatedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM)andphotoluminescencespectrometry.ThemostintenseabsorptionofY_2MoO_6hostoccurredat367nm.EnergytransferfromhostlatticetoSm~(3+)ionscouldbeobserved,andtheschematicdiagramofenergytransferwasconstructed.ThecriticalenergytransferdistanceandenergytransfermechanismbetweenSm~(3+)ionswerediscussedindetail.Consideringthehighcolorpurityandappropriateemissionintensity,Sm~(3+)dopedY_2MoO_6couldbeapromisingphosphorundernearultravioletlightexcitation.

简介：Semi-solidAl2Y/AZ91magnesiummatrixcompositesslurrywaspreparedbyultrasonicvibration,effectofultrasonicvibrationtemperatureandtimeonmicrostructureofsemi-solidslurrywasinvestigated.Theresultsshowedthatwiththeultrasonicvibrationtemperaturedecreasingthesolidvolumefractionofsemi-solidslurryincreased.Thebestultrasonicvibrationtemperaturewas600oC.Withtheincreaseofultrasonicvibrationtime,theaveragegraindiameterofprimaryа-Mgparticlesdecreasedfirstly,thenincreased,theaverageshapefactorincreasedgraduallyanddecreasedslightlyafter90s,andafewrosettedendriteswereobservedafter120s.Thebestsemi-solidslurrywithaveragegraindiameterof75μmandshapefactorof0.7weregainedafterthemeltwastreatedbyultrasonicvibrationforabout60satnearliquidustemperature(600oC).Atlast,themicrostructureevolutionmechanismofsemi-solidmagnesiummatrixcompositesslurrywasanalyzedbythetheoriesofthermodynamicsandkinetics.

简介：Er~（3＋）andLa~（3＋）codopedY_2O_3nanocrystallinepowdersweresynthesizedbygelcombustionmethodandcharacterizedwiththermalanalysis,X-raydiffraction（XRD）,transmissionelectronmicroscopy（TEM）,high-resolutionTEM（HRTEM）techniquesandfluorescencespectroscopy.Afterbeingcalcinedat1200oC,the（Y_（1–x）La_x）_2O_3：Er~（3＋）powderswereconfirmedtobecubicY_2O_3phasewiththecrystallinegrainsizeintherangeof20–40nm.TheEr~（3＋）emissionat1.53μmfromthe~4I_（13/2）→~4I_（15/2）transitionwasobserved,whichwasfoundtobeenhancedbyintroducingLa~（3＋）ions.SuchenhancementcouldbeattributedtotheadjustmentofEr~（3＋）ions＇localenvironmentbythecodopingofLa~（3＋）ions,leadingtotheincreasedgroundstateabsorptioncrosssectionofEr~（3＋）ions.

简介：

简介：(Y,Gd)BxV1-xO4-x:Eu3+phosphorswerepreparedbysolidstatereaction.Theredemissioncolorpurityof(Y,Gd)BxV1-xO4-x:Eu3+phosphorismuchbetterthanthatoftherecentwidely-usedcommercialredemittingphosphor(Y,Gd)BO3:Eu3+anditsrelativeemissionintensityis84%ofthecommercialphosphor(Y,Gd)BO3:Eu3+.Itisexpectedthat(Y,Gd)BxV1-xO4:Eu3+phosphorwillbeapromisingcandidateforPDP(plasmadisplaypanels)application.