简介：TheCurietemperatureof(Nd1-xPrx)2Fe14CoyBcompounds（x=0,0.2,…,1.0andy=O,2,4,6,14）hasbeendeterminedwithACinitialsusceptibilitymeasurement.ItwasfoundthatthevariationsofCurietempera-turewithxisnotlinearfory=0and14,whereasitislinearforothervaluesofy.Thelatticeconstantsof(Nd1-xPrx)2Fet14BweredeterminedbyusingX-raydiffraction.Thelatticeexpansionwasmostlyalongthecaxis,whereasthatalongthea-axisremainedpracticallyzeroforthewholeseries.ItissuggestedthatPratomsmayshowsitepreferenceinR2M14Bcompounds（M=FeorCo）.DuetothesubstitutionofCoforFe.thetendencyofsitepreferenceofPrbecomeslesspronounced,whichmaybeattributedtothedecreaseofdiffer-enceofcrystalelectricfield（CEF）actingonthetworareearthsiteswiththeintroductionofCoorFe.Incon-trasttothatofthePratoms,thesitepreferenceofCoiu（Nd（1-x）Prx）2Fe（14-y）CoyBcompoundsdoesnotdependonthecompositionoftherareearthsublattice（R=NdorPr）.
简介：WehavecalculatedtheelectronicstructuresofCo2FeAl1-xSix(101)surfaceusingfirst-principlesmethodbasedonthedensityfunctionaltheory.Becauseofthesurfaceeffect,theminorityspinbandgapattheFermileveldisappearsatthesurfaceofbulkCo2FeAl1-xSix.However,beneaththesurface,theminorityspingapopensattheFermilevel,whichindicatesthattheelectronicstructuresofCo2FeAl1-xSix(101)be-comeclosetothatofbulkphase.Accordingly,theCo2FeAl1-xSix(101)surfaceisacompositetri-layerstructurethatcorrespondstotheweakeningofhalf-metallicpropertyinCo2FeAl1-xSixfilms.Eventhough,thespinpolarizationofCo2FeAl1-xSix(101)surfaceisstilllargerthanthatofCo2FeAlorCo2FeSimaterials,makingCo2FeAl1-xSixapromisingspintronicsmaterial.
简介：AseriesofnovelAgCl/Ag2CO3heterostructuredphotocatalystswithdifferentAgClcontents（5wt%,10wt%,20wt%,and30wt%）werepreparedbyfacilecoprecipitationmethodatroomtemperature.TheresultingproductswerecharacterizedbypowderX-raydiffraction（XRD）,scanningelectronmicroscopy（SEM）,X-rayphotoelectronspectroscopy（XPS）,andultraviolet–visiblediffusereflectancespectroscopy（UV–VisDRS）,respectively.Thephotocatalyticactivityofthesampleswasevaluatedbyphotocatalyticdegradationofmethylorange（MO）underUVlightirradiation.WiththeoptimalAgClcontentof20wt%,theAgCl/Ag2CO3compositeexhibitsthegreatestenhancementinphotocatalyticdegradationefficiency.Itsfirst-orderreactionrateconstant（0.67h-1）is5.2timesfasterthanthatofAg2CO3（0.13h-1）,and16.8timesfasterthanthatofAgCl（0.04h-1）.TheformationofAgCl/Ag2CO3heterostructurecouldeffectivelysuppresstherecombinationofthephoto-generatedelectronandhole,resultinginanincreaseinphotocatalyticactivity.
简介：这份报纸在极其细小的颗粒的WC-12%Co合金的磁性、机械的性质上处理codopedVC/Cr3C2和sintering温度的效果。结果证明在最佳的比例的做的VC/Cr3C2的synergistic行动提高坚硬和合金的横向的破裂力量(TRS)，与更多的同类的微观结构。当合金是在1430点的sintered时?C并且与0.5%Cr3C2/0.2%VC，TRS到达3786MPa，坚硬是91.7HRA和比0.6m小的谷物尺寸。谷物生长上的数字分析在sintering过程期间证明在WC谷物边界并且Cr3C2溶解在公司上猛抛的两VC分阶段执行减少固体/液体的界面的精力，溶解和降水的过程极大地被延迟，WC谷物变粗被禁止。
简介：Basedonclustervariationmethod(CVM)andnaturaliterationmethod(NIM),order-disorderphasetransitionintheintercalationcompoundsM1/2TiS2issimulatedbycomputer.Thefavorableconditions,underwhich3a0×a0superstructureisformed,aregiven,andtheresultsareingoodagreementwiththeexperimentsandtheoreticalcalculations.TherelationshipbetweencriticaltemperatureandM-ion-vacancyinteractionparameterislinear.
简介：氮(N)和磷(P)共同做锐钛矿TiO2nanosheets被与外国先锋做的高温度的P跟随的低温度的自我做的N-TiO2认识到。做过程的P能维持好TiO2nanosheets形态学与，这被发现暴露{001}方面。掺杂物的化学状态显示N和P原子在TiO2格子在O地点上代替O。与纯TiO2和做N的TiO2,N-P相比，共同做的TiO2nanosheets在可见轻政体展出更强壮的光吸收和染料分子的更高的降级率。提高的photocatalytic性质被归因于二个因素。一方面，N-P共同做能有效地从3.20～2.48减少TiO2的乐队差距?eV，在可见的光导致吸收的改进政体。在另一方面，存在暴露{001}TiO2nanosheets的方面能在反应导致photogenerated电子和洞的有效分离。
简介：阶段和磁电机在合金R(Co_(1-x)Sn_x)的热量的效果有x=的_20，0.025，0.050，0.075，和0.100被X光检查衍射分析和磁化测量调查。在RCo_2的Sn的替换是有限的。为RCo_2的合金的立方的MgCu_2-typestructure被X光检查粉末衍射证实，留下的合金主要由RCo_2阶段组成了，与一些RCo_3和R_5Sn_3杂质阶段一起。Theimpurity阶段随Sn内容的增加增加。合金的T_c不对为Dy(Co_(1-x)Sn_x)的Sn替换很敏感_2和Tb(Co_(1-x)Sn_x)_2inGd(Co_(1-x)Sn_x)_2，居里温度显著地增加。最大的磁性的熵在合金Dy(Co_(1-x)Sn_x)改变_2(x=0，0.025，0.050，0.075)是5.78，5.43，3.88，并且2.98J·kg~(-1)·K~(-1),分别地，并且那些在Tb(Co_(1-x)Sn_x)_2(x=0，0.025)是3.44，and2.29J·kg~(-1)·K~(-1)分别地0-2.0T在应用的地里变化。
简介：采用扫描电镜、能谱仪以及X射线衍射仪对具有WC＋β（β为钴基粘结相）两相结构的WC-11Co-0.71Cr3C2-0.06RE（RE为含La、Ce、Pr、Nd的混合稀土）硬质合金烧结体表面进行观察与分析。结果表明，在烧结过程中合金中的La、Ce、Pr、Nd通过定向迁移与烧结炉内气氛中的S、O等杂质元素结合，在合金烧结体表面形成RE2S3（主）和RE2O2S（少量）弥散相。从合金中Cr3C2的热力学稳定性、Cr在Co中的溶解度特性以及稀土原子激发等3个方面，对稀土迁移活性的激发机制和稀土原子的定向迁移机制进行分析与讨论。
简介：ThepermeabilityandstabilityofSm_(0.7)Sr_(0.3)CoO_(3-δ)(SSCO)regardingthespecialrequirementsforcarboncaptureandstorage(CCS)applicationwereinvestigated.PureCO_wasusedasthesweepgasat900°C,leadingtothattheoxygenpermeationfluxdecreasesbyabout34%.SeveralcyclesofchangingthesweepgasbetweenheliumandCO_2indicatethegoodreversibilityofthisdegradation.BothcarbonateformationandadsorptionofCO_2onthemembranesurfaceareresponsibleforthedegradationofthemembraneperformance.ThebetterCO_2resistanceresultsfromthesubstitutionofSmforSrduetothehigheracidityofSm_2O_3(1.278)thanthatofSrO(0.978)andadiscontinuouslayerofcarbonate.
简介：Theexchangecouplingattheferromagnetic/antiferromagnetic(FM/AFM)interfaceisinfluencedbyboththemagneticstructureandthecrystallinemicro-structure.Co/FeMn/Cothinfilmswith0.4nmPtspacerlayerinsertedintotheCo/FeMnandFeMn/Cointerfacerespectivelyweredepositedbymeansofmagnetronsputtering.ThetwointerfacesuponandbeneaththeFeMnlayershowdistinctbehaviorsbeforeandafterthePtspacerinserted.ThereisaremarkableshrinkoftheinterfacialuncompensatedspinswithintheFeMnbottominterfacialmonolayers,whereasarelaxationofthepinningstrengthoftheFeMninterfacialspinsalongtheout-of-planedirectionoccursatthetopinterface.XRDanalysisindicatesthePtlayerupontheFeMnlayerformsanfcc(002)texture,implyingthemagneticdiscrepancybetweenthetopandbottomFeMninterfaceshascrystallinestructuralorigins.
简介：Low-CoLa1.8Ti0.2MgNi8.9Co0.1alloyswerepreparedbymagneticlevitationmeltingfollowedbyannealingtreatment.TheeffectofannealingonthehydrogenstoragepropertiesofthealloyswasinvestigatedsystematicallybyX-raydiffraction（XRD）,pressure-compositionisotherm（PCI）,andelectrochemicalmeasurements.TheresultsshowthatallsamplescontainLaNi5andLaMg2Ni9phases.LaCo5phaseappearsat1,000℃.Theenthalpychangeofallhydridesiscloseto-30.6kJ·mol-1H2ofLaNi5compound.Annealingnotonlyincreaseshydrogencapacityandimprovescyclingstabilitybutalsodecreasesplateaupressureat800and900℃.Afterannealing,thecontractionofcellvolumeandtheincreaseofhydridestabilitycausethehighratedischargeabilitytoreduceslightly.Theoptimumalloyisfoundtobeoneannealedat900℃,withitshydrogencapacityreachingupto1.53wt%,anddischargecapacityremaining225.1mAh·g-1after140charge–dischargecycles.
简介：Inthisstudy,twokindsofWC–Cocoatingswithdifferentdecarburizationlevelsweredepositedbyhigh-velocityoxy-fuel(HVOF)sprayingusingtheultrafineWC–Cocompositepowderandcommercialmicronsizedpowder,respectively.Thehardnessandelasticmodulusweremeasuredonthetopsurfaceandcrosssectionsofthepreparedcoatingsbythenanoindentationmethod.Theresultsshowthattheultrafine-structuredcoatinghasmuchhigherdensityandinhibiteddecarburizationthantheconventionalcoating,whichthusresultsinhigherhardnessandelasticmodulusvaluesthanthemicronsizedcoating.Thewearresistanceofthermal-sprayedcermetcoatingsgreatlydependsonthecross-sectionalhardnessandelasticmoduluswhichreflectsthebondstrengthbetweensplatstosomeextent.Basedontheanalysis,abetterunderstandingofthemicrostructureandpropertiesincermetcoatingmaterialswasobtained.
简介：EmployingLi2CO3,NiO,Co3O4,andMnCO3powdersasstartingmaterials,Li[Ni1/3Co1/3Mn1/3]O2wassynthesizedbysolid-statereactionmethod.Variousgrindingaidswereappliedduringmillinginordertooptimizethesynthesisprocess.Aftersuccessiveheattreatmentsat650and950℃,thepreparedpowderswerecharacterizedbyX-raydiffraction(XRD)analysis,scanningelectronmicroscopy,andtransmissionelectronmicroscopy.Thepowderspreparedbyaddingsalt(NaCl)asgrindingaidexhibitaclearR3mlayerstructure.ThepowdersbyothergrindingaidslikeheptaneshowsomeimpuritypeaksintheXRDpattern.Theformerpowdersshowauniformparticlesizedistributionoflessthan1μmaveragesizewhilethelattershowsawidedistributionrangingfrom1to10μm.EnergydispersiveX-ray(EDX)analysissshowthattheratioofNi,Co,andMncontentinthepowderisapproximately1/3,1/3,and1/3,respecively.TheEDXdataindicatenoincorporationofsodiumorchlorineintothepowders.Charge-dischargetestsgaveaninitialdischargecapacityof160mAh·g-1forthepowderswithNaCladditionwhile70mAh·g-1forthepowderswithheptane.
简介：TheTm-Ni-Coalloyfilmshavebeenpreparedbythesweeppotentialdepositiontechnique.ThesurfaceappearanceofTm-Ni-Coalloyfilmswassilver,smoothandadhesive.ThesurfacesofTm-Ni-Coalloyfilmsobservedbyscanningelectronmicroscope(SEM)wereuniform,adhesiveandcompact.Thesizesofmetallicgrainswereabout80-100nm,100-200amorphousasprovenbytheX-raydiffraction(XRD).
简介：磁性的元素Fe，公司和Ni的线性热扩大(CLE)的系数用与MATLAB计算相结合的理论模型从试验性的信息被估计。模型参数能精确地被决定，并且估计的数据在对试验性的结果的好同意。便于评价，热扩大的理论被使用把CLE分开成它的无磁性、磁性的部件。对CLE的无磁性的贡献的计算基于MnBi/NdFeB混血儿的修改Grc性质结合的磁铁都逐渐地减少，当混合磁铁的密度几乎线性地改善时。在293-398的一个温度范围?K，混合磁铁的coercivity温度系数从0.59逐渐地改善?%比较。建模和频率与二低角落频率认为压力消除阀门是一个秒顺序系统是合理的试验性的结果表演。PID控制，死了的乐队赔偿控制和鷸?鷸？？
简介：1ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｓｔｒｕｃｔｕｒｅａｎｄｅｌｅｃｔｒｏｃｈｅｍｉｃａｌｐｒｏｐｅｒｔｉｅｓｏｆｎｉｃｋｅｌｈｙｄｒｏｘｉｄｅｈａｖｅｂｅｅｎｓｔｕｄｉｅｄｅｘｔｅｎｓｉｖｅｌｙｄｕｅｔｏｉｔｓｉｍｐｏｒｔａｎｃｅａｓａｃｔｉｖｅｍａｔｅｒｉａｌｓｉｎｎｉｃｋｅｌｂａｔｔｅｒｙｓｙｓｔｅｍｓ[1].Ａｆｕｎｄａｍｅｎｔａｌｕｎｄｅｒｓｔａｎｄｉｎｇｏｆｔｈｅｅｆｆｅｃｔｓｏｆｍｅｔａｌｌｉｃａｄｄｉｔｉｖｅｓａｎｄｉｍｐｕｒｉｔｉｅｓｏｎｔｈｅｎｉｃｋｅｌｈｙｄｒｏｘｉｄｅｅｌｅｃｔｒｏｃｈｅｍｉｓｔｒｙｃｏｕｌｄｂｅｏｆｇｒｅａｔｖａｌｕｅｔｏｔｈｅｂａｔｔｅｒｙｉｉｎｄｕｓｔｒｙ[2].Ｔｈｅｐｒａｃｔｉｃａｌｉｍｐｏｒｔａｎｃｅｏｆｎｉｃｋｅｌｈｙｄｒｏｘｉｄｅｅｌｅｃｔｒｏｃｈｅｍｉｓｔｒｙｉｓｎｏｔｌｉｍｉｔｅｄｔｏｂａｔｔｅｒｙａｐｐｌｉｃａｔｉｏｎｓ.Ｎｉｃｋｅｌｈｙｄｒｏｘｉｄｅｅｌｅｃｔｒｏｄｅｓａｌｓｏｃａｎｂｅｕｓｅｄｉｎｗａｔｅｒｅｌｅｃｔｒｏｌｙｓｉｓ[3].Ｔｈｅｕｓｅｏｆｍｅｔａｌｌｉｃａｄｄｉｔｉｖｅｓｔｏｍａｎｉｐｕｌａｔｅｔｈｅｅｌｅｃｔｒ...
简介：AseriesofPr-CothinfilmsweredepositedontheSi(100)substrateswithCrunderlayerbymagnetronsputtering.Theeffectsofboththepost-annealingtemperatureandtheannealingtimeonthemicrostructureandmagneticpropertiesforthePr-Cofilmswerestudiedsystematically.Theas-depositedPr-Cothinfilmsaremostlyamorphousandtendtocrystallizeafterannealingattemperaturesabove600℃.Whentheannealingtimeisincreased,thefilmsshowacomplicatedstructurewithvariousphasesco-existing.Accordingly,theas-depositedfilmandlowtemperatureannealedfilmsaresoftmagnetsandfilmsannealedattemperaturesbeyond600℃tendtobehardmagnets.Whentheannealingtimeisincreasedfrom5minto2h,thefilmstransferfromhardmagnetstosoftagain.Thesampleannealedat600℃for10minshowsthelargestcoercivityof0.59T.
简介：Thermodynamiccalculation,SEM(scanningelectronmicroscopy),TEM(transmissionelectronmicroscopy),XRD(X-raydiffraction),phaseextraction,andchemicalanalysiswereemployedtostudythephasestabilityandphaseprecipitationinanewNi-Cr-Cobasesuperalloyheat-treatedat704and760℃foralongtime.Theresultsshowthattheprecipitatesofthisnewalloyheat-treatedatstandardannealingconditionandheat-treatedat704and760℃foratimeupto2000hareγ′,MC,M23C6,andM6C,andηphaseformsatgrainboundariesandinmatrixofsamplesheat-treatedat760℃aswell.Themassfractionsofγ′(+η),MC,M23C6,andM6Cinallsampleshavenolargechangeswithanincreaseinagingtime,butγ′precipitatesgrowobviously.Theγ′-to-ηtransformationinthesamplesheat-treatedat760℃tookplacewithincreasingagingtime.TheηprecipitatesformaWidmanstattenpattemandtheγ′phaseshaveremeltedpartlyinthesamplesheat-treatedat760℃.Thealloymaintainsabettermicrostructuralstabilityduringprolongedagingat704℃,butaworsemicrostructuralstabilityduringprolongedagingat760℃.
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![Preparation of Li[Ni1/3<b style='color:red'>Co</b>1/3Mn1/3]O<b style='color:red'>2</b> powders for cathode material in secondary battery by solid-state method](/image/thesis14 "Preparation of Li[Ni1/3<b style='color:red'>Co</b>1/3Mn1/3]O<b style='color:red'>2</b> powders for cathode material in secondary battery by solid-state method")
