简介：Theeffectsoflanthanum-praseodymium-ceriummischmetal(LPC)onthemicrostructureandmechanicalpropertiesofMg-Alalloywereinvestigated.WiththeadditionofLPC,anadditionalrod-likeAl11La3phasewasdepositedinthealloy.LPCgreatlyimprovesthetensilestrengthofcastMg-Alalloysbutnegativelyaffectstheelongationofcastalloysabove473K.Castalloysarestrengthenedbybothprecipitationstrengtheninganddispersionstrengtheningatambienttemperature.Whenthetemperatureexceeds473K,onlythedispersionoperatesasastrengtheningmechanism.

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简介：Theresincompositematerials(RCM)werepreparedbythemethodofdopingresinwithtourmalinepowdersmodifiedwithlanthanumelement.Itwascharacterizedbyscanningelectronmicroscope(SEM),IRradiationdetermination,X-raydiffraction(XRD),andfouriertransforminfraredspectroscope(FTIR).TheresultsshowedthattheRCMcouldradiatehigherintensityoffarinfrared.Themolecularmovementwasstrengthenedandtheinter-molecularcontactswereeasilyreducedwhenthedieseloilwasdealtwiththeRCM.TheeffectsoftheRCMontheoilconsumptionandairpollutantemissionsofoil-burningboilerwereinvestigated.Theoil-savingrateoftheRBS·VH-1.5boilerdealtwiththeRCMwas2.76%,andthereducingratesofCOandNOintheexhaustgaswere32.9%and15.8%,respectively.

简介：一系列新奇的镧锶铝酸盐黄磷，Ce3+-dopedLaSr2AlO(5-0.5x)Fx(LSAF)黄磷成功地在减少空气下面用高温度的稳固的州的合成过程被综合(H2/N2=1/4)。X光检查衍射模式表明那件LSAF样品是纯LaSr2有1250的sintering温度的AlO5阶段?桰獯桰牯?祢挠湯牴汯楬杮挠祲瑳污映敩摬攠癮物湯敭瑮眠瑩?汦潵楲敮椠湯?猼灵?猯灵>

简介：有公式La9.33Si6O26的磷灰石类型镧硅酸盐被大音阶的第五音胶化过程准备。答案的pH价值影响的大音阶的第五音的同质被调查。大音阶的第五音的粘性稍微增加第一然后因为占优势的反应机制从水解作用反应改变到冷凝作用反应，突然地增加。另外，为粘性的增加的发作时间从pH弄短1到pH4。冻结时间与增加答案的pH减少。因此，大音阶的第五音的pH应该是不到4形成胶化。有起始的pH的大音阶的第五音希腊语的第六个字母潜力和最大的稳定性的2表演最大值价值。为有起始的pH的样品2，在弄干的胶化被锻烧在以后，纯磷灰石类型镧硅酸盐La9.33Si6O26成功地被准备了1000

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简介：Aseriesofcoal-basedactivecarbon(AC)catalystsloadedbyFe-Cu,Fe-Cu-CeandFe-Cu-Lawerepreparedbythesol-gelmethodforcarbondisulfide(CS2)hydrolysisandtheirperformancesforCS2hydrolysisinafixed-bedreactorwereinvestigatedinthiswork.TheresultsshowedthatthekindofrareearthoxideanditscontenthadobviouseffectonhydrolysisremovalofCS2.Theeffectsoftemperature,spacevelocity,CS2concentrationandO2concentrationwerealsodiscussedrespectively.Furthermore,thesuitableoperatingconditionswereobtained.Itwasfoundthatthepoisoningofhydrolysisactivesitescouldresultintheformationofsulfuricacidonthecatalystsurface.

简介：掺杂物在在协议的sintering期间定制微观结构起一个关键作用。这些掺杂物可以在体积以内形成稳固的答案，或分离到谷物边界(GB)和稳固蒸汽的接口(免费表面)，引起管理质量的一种不同精力充沛的情形的各个在densification和谷物生长期间搬运。在这个工作，控制掺杂物分发的力量，特别地在表面和GB的并发的分离的可能性，基于分离的各自的热含量被讨论。一个方程基于系统的最小的吉布斯精力被导出从试验性的接口精力数据决定分离的热含量，并且当氧化钇的接口energetics上的掺杂物在它sintering的最后的阶段期间稳定了氧化锆，结果适用描绘La的角色。La实质地减少，这被显示出GB和表面精力(不同地)当sintering进行，动态地在这个阶段影响它的驱动力，和作为结果的谷物生长和densification。

简介：我们在甲烷(POM)的部分氧化上调查了填满的格子氧的锻烧温度，反应温度，和不同数量的效果到把perovskite类型LaFeO3氧化物用作氧施主而不是气体的氧的合成气体，它被大音阶的第五音胶化方法准备，并且氧化物被XRD，TG/DTA，和赌注描绘。结果显示粒子尺寸增加了，锻烧温度增加，当赌注和CH4变换衰退了，锻烧温度当气体的氧不在时作为氧施主用LaFeO3氧化物增加时。在象上面那样的高水平仍然是的公司选择92%，并且当锻烧温度增加了，稍微增加了。到甲烷空气的LaFeO3氧化物的暴露提高了氧迁居在有由于格子氧和氧化说的Fe离子的减小的损失联机的时间的体积同时。高反应温度对从向为有高公司选择的合成气体生产的表面的体积的氧种类的迁居有利。为由顺序的氧化还原作用反应的POM的产品分发和进化被填满的格子氧的数量与气体的氧决定。最佳的过程应该衰退甲烷的全部的氧化，和增加甲烷的部分氧化的选择。

简介：Solidoxidefuelcells(SOFCs)offerhighenergyconversion,lownoise,lowpollutantemission,andlowprocessingcost.Despitemanyadvantages,SOFCsfaceamajorchallengeincompetingwithothertypesoffuelcellsbecauseoftheirhighoperatingtemperature.ThenecessitytoreducetheoperationaltemperatureofSOFCshasledtothedevelopmentofresearchintothematerialsandfabricationtechnologyoffuelcells.Theuseofcompositecathodessignificantlyreducesthecathodepolarizationresistanceandexpandsthetriplephaseboundaryareaavailableforoxygenreduction.Powderpreparationandcompositecathodefabricationalsoaffecttheoverallperformanceofcompositecathodesandfuelcells.Amongmanytypesofcathodematerials,lanthanum-basedmaterialssuchaslanthanumstrontiumcobaltferrite(La1-xSrxCo1-yFeyO3-haverecentlybeendiscoveredtooffergreatcompatibilitywithceria-basedelectrolytesinperformingascompositecathodematerialsforintermediate-tolow-temperatureSOFCs(IT-LTSOFCs).Thispaperreviewsvariousceria-basedcompositecathodesforIT-LTSOFCsandfocusesontheaspectsofprogressandchallengesinmaterialstechnology.

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简介：La15Fe77B8hydrogenstoragealloyswerepreparedusingavacuuminduction-quenchingfurnace.TheresultsofX-raydiffraction(XRD)andscanningelectronmicroscopy(SEM)suggestedthatLa15–xSmxFe2Ni76Mn5B2(x=0,2,4,6)alloyshadmultiphasestructureincludingthemainLaNi5phase,La3Ni13B2phaseand(Fe,Ni)phase.WiththeincreasingsubstitutionofSmforLa,themainphasestructureofalloysdidnotchange,whiletheunitcellvolumesdecreased,thecyclestabilitywasimprovedandthemaximumdischargecapacitydecreased,butthelowtemperaturemaximumdischargecapacityofthesamesubstitutionalloywasgraduallyapproachingthemaximumdischargecapacityatroomtemperature,whichshowedthatLa15Fe77B8hydrogenstoragealloysofthepartialsubstitutionofSmforLahadbetterlow-temperaturedischargeability(LTD).Forthesamesubstitutionalloys,self-dischargecharacteristicsandcyclestabilityatlowtemperaturewerebetterthanthatatroomtemperature.Furthermore,thehigh-ratedischargeability(HRD)andtheexchangecurrentdensityI0firstincreasedandthendecreasedwiththeincreasingofSmcontent,whereasthehydrogendiffusioncoefficientDinalloybulkdecreasedgradually,whichindicatedthatappropriatesubstitutionofSmforLaimprovedtheelectrochemicalkineticspropertiesofthealloys.TheHRDwasmainlydominatedbythecharge-transferrateonthealloysurface.