简介：Na5+xYAlxSi4-xO12superionicconductorsarerhombohedralR3cspacegroup.Theirstructuresarecharacterizedby(Alx/4Si1-x/4)O4tetrahedralinkedtoformpuckered(Al3xSi4-x)4O35ringsparalleltothebasalplaneofthehexagonalcell.Theserings,separatedbypartsofsodiumoxygenpolyhedron,arestackedtoformlargerigidcolumsparalleltocaxis.Thecolumnsarelinkedby[YO6]octahedratoformathree-dimensionalFrameworkwithlargechannelsbetweentherings.PartsofNaionslocatedinthecoresofthecolumnsaremovable.Intermsoftheconductionmechanism,theconcentrationofconductingNa+ionswascarriedoutandcomparedwiththeexperimentalresults.Itwasfoundthatthetheoreticalvaluesaccordwiththeexperimentalresults.

简介：Withpositronannihilationradiationonedimensionangular-correlationdevice,itismeasuredthatpositronannihilationradiationonedimensionangular-correlationcurvesofpolycrystalsodiumionconductorNa5Y1-xCrxSi4O12（NYCS）system.Afterelectronmomentumdistributioncurvesarenormalized,linearparametersarecalculated.TheparametersH,WandSshowthechangeofNa+ionvacancyconcentrationinNYCSseriessamples.TheresultsshowthatparametersH,WandSofonedimensionangular-correlationcurvesofthosesamplesvarygreatlywithCr2O3contents.WithCr2O3contentincreasing,HandSparametersincrease,butWdecreases,andreachesextremesatx=0.05;thenwithCr203addingcontinually,parametersHandSdecreasegradually,parameterWincreasesgradually.Thisshowsthat,inaddtiontoCr2O3,theconductivityhascloserelation

简介：铈磷酸盐粉末被二氧化铈和磷酸盐酸的直接稳固的液体反应在Ce综合：1:1的P比率。阶段纯并且细粒尺寸CePO_4powers能被锻烧获得是比600degC高在温度收到了粉末。它是表明的thaiCePO_4粉末的粒积和形态学在各种各样的温度被锻烧。有趣的分层的晶体结构和在CePO_4内在渗出的表面上沿着挤压应力方向交叉并且发生的一系列微裂缝被观察。CePO_4的韧性和machinabililty陶器被归因于分层的结构。连续用机器制造碎片在转的表面上被观察。

简介：1.IntroductionLightrareearthadditioncanremarkablyenhancetheservicelifeofFe-Cr-Alalloyforelectricalheatingelement,butitscontentinthealloymustbecontrolledbelowthelevelof0.1wt-%.Whenthecontentexceedsthat,theperformance

简介：导向剂是结晶尚未完全的晶核雏形，是控制沸石结晶过程最有效的手段。通过在溶液中引入一定量的导向剂，缩短沸石的晶化时间，很好地改善了产品的粒度分布和团聚程度，合成出性能优异的超微4A沸石。

简介：在美国能源部资助下的一个开发项目（磷酸锂铁阴极材料）正在TiaxLLC公司进行中。据说，这种材料可满足电动汽车用的锂离子电池的工艺需求。目前，LiFePO4拥有相当高的能量密度，但是因导电不良而使功率容量受限。

简介：Si3N4/TiCnanocompositeceramicshavebeenfabricatedbyhotpressingtechniquewithAl2O3andY2O3asadditives.TheresultsshowedthatwelldispersedcompositepowderwascarriedoutbyaddingdispersantandadjustingpHvaluesofsuspensions.RemarkableincreaseinflexuralstrengthatroomtemperatureswasobtainedbyaddingnanoparticlesinSi3N4matrixwith10%(wtpct)ofnano-Si3N4and15%ofnano-TiC.Theflexuralstrength,fracturetoughnessandhardnesswere1025MPa,7.5MPa·1/2and15.6GPa,respectively.Themicrostructuresofmaterialswereanalyzedbyscanningelectronmicroscopy(SEM)andtransmissionelectronmicroscopy(TEM),whichindicatedthatTiCnanoparticlesdistributeinthematrixandatthegrainboundaries.Accordingtothefractureform,lowcontentsofnanoparticlescouldrefinematrixgrainsandleadtothecrackdeflectionaswellascrackpinning.Themultiplexmicrostructurewasformedbymixingnano-Si3N4particles.Thecracktrajectoriesexhibitedcrackdeflection,rod-likegrainbridgingandpull-out.

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简介：乌克兰海绵钛制造厂，扎波里日钛镁工厂（ZTMK）在2006年1～4月内生产了3186mt海绵钛，比2005年同期的2590mt增加了23％。该公司在4月份生产海绵钛852mt，3月份生产了870mt，而2005年4月份只生产了609mt。ZTMK生产的海绵钛，95％用于出口，用于航空工业。ZTMK的海绵钛产能为年产2万t，此外还生产钛、镁、锗等其他产品。ZTMK是一家国有公司，它在2005年生产了海绵钛8397mt，比2004年同期的7497mt增加了12％。

简介：Manganesephthalocyanine(MnPc)-Fe3O4nanoparticlescompositewaspreparedandcharacterized.TheresultsshowthatMnPcarecompletedonthesurfaceofFe3O4nanoparticlesinthestateofsinglemolecule.ThereiseffectivecompositebetweenMnPcandFe3O4nanoparticleswhichcanimprovetheantioxidizationabilityofFe3O4nanoparticlesgreatly.Thecompositewasdispersedintochlorinatedparaffinoiltoformelectromag-netorheological(EMR)fluidwithhighactivity,andtheEMRpropertiesofthisEMRfluidarestudied.

简介：LiMn2O4wassynthesizedrapidlybymicrowaeheating.Theproductphasesofthemicrowavesynthesisandconventionalsolid-statesynthesiswerecomparativelyinvesitigated.Thecapacityofmicrowavesynthesisproductdecreasesrelativelyslow.Thelithiumioncanbeinsertedintoandextractedfromthespinelframeworkstructurefluentlyaftercycling.Butthecapacityoftheconventionalsolid-statesynthesisproductismoreremarkablylowered.Thespinelframeworkstructurewasdestroyedwhichhinderedthelithiumionfrominsertingandextracting.Theinfluentialfactorsoftheprocessparametersarediscussedsuchasheatpreservationtime,pre-heatingat400℃for24handcoupledagent.

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简介：采用柠檬酸作为改性剂来改性纳米Fe3O4磁性颗粒，成功研制成溶胶颗粒（粒径为40nm左右），饱和磁化强度为0．84emμ／g的水基Fe3O4磁性液体。重点探讨了pH值、改性剂用量、改性温度对改性效果的影响，优化出改性温度为80℃，pH值范围为4．5-6．5等的最佳制备工艺条件；采用透射电镜、红外、紫外可见光分光光度计等分析方法对核壳式结构的粒子尺寸、形貌及其化学组成成份等进行了测试表征。

简介：Thesol-gelprocessofcitricacidchelatingwithmetalcationsforthesynthesisofnormalspinelLiMn2O4andthereactionmechanismwereinvestigatedbymeansofXRD,IR,TG-DTA,andSEM.Theresultsshowthatatthebeginninglithiumcitrateandchelatecompoundofcitricacidwithmanganeseionsformed,andthenwithheatingtheesterificationandcondensationreactionsoccuredbetweenthemandglycol.TheproductsobtainedarepolymersinwhichmetalcationsaredistributedhomogeneouslyonatomicscalethatensurehighreactivitytocationsofLi+andMn2+.Firingthegelpreparedbythisprocess,thelatticediffusionsofsolidreactantionscausedbynon-homogeneityofreactantsareeliminatedandavoided.At400℃phase-pureLiMn2O4withnanometerscalecrystallizationhavingprecisestoichiometryandperfectcrystallizationcanbeobtained.Themodelofchelatecoordinateofdouble-moleculebetweencitricacidandMn2+inthegelnetworkisproposed.ItisimportantforexplainingthedispersionstateofMn2+andtheformationprocessofgelbythismodel.

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简介：One-dimensional(1D)nanomaterialsandnanostructureshavereceivedmuchattentionduetotheirpotentialinterestforunderstandingfundamentalphysicalconceptsandforapplicationsinconstructingnanoscaleelectricandoptoelectronicdevices.Zincsulfide(ZnS)isanimportantsemiconductorcompoundofII-VIgroup,andthesynthesisof1DZnSnanomaterialsandnanostructureshasbeenofgrowinginterestowingtotheirpromisingapplicationinnanoscaleoptoelectronicdevices.Thispaperreviewstherecentprogresson1DZnSnanomaterialsandnanostructures,includingnanowires,nanowirearrays,nanorods,nanobeltsornanoribbons,nanocables,andhierarchicalnanostructuresetc.Thisarticlebeginswithasurveyofvariousmethodsthathavebeendevelopedforgenerating1Dnanomaterialsandnanostructures,andthenmainlyfocusesonstructures,synthesis,characterization,formationmechanismsandopticalpropertytuning,andluminescencemechanismsof1DZnSnanomaterialsandnanostructures.Finally,thisreviewconcludeswithpersonalviewstowardsfutureresearchon1DZnSnanomaterialsandnanostructures.

简介：ThetransportpropertiesintheLa2/3(Ca1-xSrx)1/3MnO3(x=0,1/3,2/3)filmspreparedusingtheRFmagnetronsputteringmethodwereinvestigated.TheeffectoftheCa,Srdouble-dopingattheApositionintheLa2/3A1/3MnO3onthestructureofthetargetsandtransportofthefilmshasbeenstudied.Withtheincreaseofx,thestructuresofthetargetstransformfromtherhombohedralphasetothecubicphase;themetal-insulatorphasetransitiontemperature(Tp)ofthefilmsincreases;andthecorrespondingpeakresistivitydecreases.Allthephenomenacanbequalitativelyexplainedbythelatticeeffect.

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