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：InordertoimprovetheelectrochemicalcyclestabilityofLa-Mg-Nisystem(PuNi3-type)hydrogenstoragealloy,NiinthealloyswaspartiallysubstitutedbyM(M=Cu,Al,Mn).AnewLa-Mg-NisystemelectrodealloysLa0.7Mg0.3Ni2.55-xCo0.45Mx(M=Cu,Al,Mn;x=0,0.1)werepreparedbycastingandrapidquenching.Theeffectsofelementsubstitutionandrapidquenchingonthemicrostructuresandelectrochemicalperformancesofthealloyswereinvestigated.TheresultsbyXRD,SEMandTEMshowthatthealloyshaveamultiphasestructure,includingthe(La,Mg)Ni3phase,theLaNi5phaseandtheLaNi2phase.Therapidquenchingandelementsubstitutionhaveanimperceptibleinfluenceonthephasecompositionsofthealloys,butbothchangethephaseabundanceofthealloys.Therapidquenchingsignificantlyimprovesthecompositionhomogeneityofthealloysandmarkedlydecreasesthegrainsizeofthealloys.TheCusubstitutionpromotestheformationofanamorphousphaseintheas-quenchedalloy,andareversalresultbytheAlsubstitution.Theelectrochemicalmeasurementindicatesthattheelementsubstitutiondecreasesthedischargecapacityofthealloys,whereasitobviouslyimprovesthecyclestabilityofthealloys.ThepositiveinfluenceofelementsubstitutiononthecyclelifeofthealloysisinsequenceAl＞Cu＞Mn,andnegativeinfluenceonthedischargecapacityisinsequenceAl＞Mn＞Cu.Therapidquenchingsignificantlyenhancesthecyclestabilityofthealloys,butitleadstoadifferentextentdecreaseofthedischargecapacityofthealloys.

简介：FluorescenceandcofluorescencepropertiesofTb(Ⅲ)solidcomplexeswerestudiedusingpyromelliticacid(PMA)asligandandfluorescenceinertionsasdopingelements.Thecofluorescenceenhancement,aresultofligandsensitizedfluorescence,wasobservedinTb(Ⅲ)solidcomplexesdopedwithfluorescentinertionsLa(Ⅲ),Gd(Ⅲ),Ca(Ⅲ),andSr(Ⅲ).Theeffectofthetypeandcontentofdopingelementsonfluorescenceenhancementwasstudied,andoptimumconditionsweredetermined.TheresultsshowthatGd(La,Ca,Sr)hasclearcofluorescenceeffectinsolidcomplexTb-M-PMAsystem,andinpresentwork,rareearthcomplexfluorescentpowderthatemitsbrightgreenfluorescenceatultravioletexcitationwasobtained,whichhadpotentialapplicationasfluorescentanti-counterfeitink.

简介：Basedonclustervariationmethod(CVM)andnaturaliterationmethod(NIM),order-disorderphasetransitionintheintercalationcompoundsM1/2TiS2issimulatedbycomputer.Thefavorableconditions,underwhich3a0×a0superstructureisformed,aregiven,andtheresultsareingoodagreementwiththeexperimentsandtheoreticalcalculations.TherelationshipbetweencriticaltemperatureandM-ion-vacancyinteractionparameterislinear.

简介：1ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｒａｒｅｅａｒｔｈｃｏｂａｌｔａｌｌｏｙｓｈａｖｅｔｈｅｐｏｔｅｎｔｉａｌｆｏｒｍａｋｉｎｇｔｈｅｍａｇｎｅｔｉｃａｎｄｍａｇｎｅｔｏｏｐｔｉｃａｌｍａｔｅｒｉａｌｓ.Ｓｏｆａｒ,ｔｈｅｒａｒｅｅａｒｔｈｃｏｂａｌｔａｌｌｏｙｆｉｌｍｓａｒｅｓｕｂｓｔａｎｔｉａｌｌｙｐｒｏｄｕｃｅｄｂｙｓｐｕｔｔｅｒｉｎｇｏｒｖａｃｕｕｍｐｌａｔｉｎｇ.Ｉｆｓｕｃｈｆｉｌｍｓａｒｅｐｒｅｐａｒｅｄｂｙｅｌｅｃｔｒｏｄｅｐｏｓｉｔｉｏｎｉｎｓｔｅａｄ,ｐｒｏｄｕｃｔｉｏｎｅｆｆｉｃｉｅｎｃｙｗｏｕｌｄｂｅｉｍｐｒｏｖｅｄａｎｄｔｈｅｃｏｍｐｏｓｉｔｉｏｎｏｆｔｈｅａｌｌｏｙｃｏｕｌｄｂｅｃｏｎｔｒｏｌｌｅｄ.Ｂｅｃａｕｓｅｔｈｅｏｘｉｄａｔｉｏｎｒｅｄｕｃｔｉｏｎｐｏｔｅｎｔｉａｌｓｏｆｒａｒｅｅａｒｔｈｅｌｅｍｅｎｔｓａｒｅｖｅｒｙｎｅｇａｔｉｖｅ,ｏｒｇａｎｉｃｓｏｌｖｅｎｔｓｍａｙｂｅｕｓｅｄａｓｅｌｅｃｔｒｏｌｙｔｉｃｍｅｄｉａ.ＥｌｅｃｔｒｏｄｅｐｏｓｉｔｉｏｎｏｆＧｄＣｏａｎｄＳｍＣｏｉｎｏｒｇａｎｉｃｓｏｌｕｔｉｏｎｓｈａｓｂｅｅｎｒｅｐｏｒｔｅ...

简介：LayeredcathodematerialLiCo1/3Ni1/3Mn1/3O2wassynthesizedbyPechiniprocess,andinvestigatedusingX-raydiffraction(XRD),scanningelectronmicroscopy(SEM)andgalvanostaticcharge/dischargecycling.Thesampleiswell-crystallizedandhasaphase-purea-NaFeO2structure.Theparticlesizesareuniform,anddistributedintherangeof20-200nm.TheinitialdischargecapacityoftheLi/LiCo1/3Ni1/3Mn1/3O2cellwasabout149mAh·g-1whenitwascycledatavoltagerangeof4.5-2.3Vwithaspecificcurrentof0.25mA.Theresultisbetterincomparisonwithsolid-statesolutionmethod.Thesyntheticprocedurewasdiscussed.Threemajorreactions:chelation,esterification,andpolymerizationsuccessivelyoccurred.

简介：对多次电镀铬的300M钢试样的疲劳性能、氢脆倾向、疲劳断口进行了测试和分析，以研究镀铬次数、镀铬层厚度对300M钢疲劳性能的影响规律。结果表明：镀铬层对300M钢的疲劳性能影响很大，在试验条件下，带镀层试样较未电镀试样的疲劳强度和相同应力条件下的疲劳寿命降低约60％，且镀层越厚疲劳寿命越低；这种影响与电镀次数无明显关系，只要执行正常的除氢工艺，重复电镀多达15次的300M钢仍未发现氢脆倾向。断口分析表明：疲劳裂纹主要起源于镀铬层或镀层与基体的界面处，疲劳性能的大幅降低主要与镀铬层本身的特性有关。

简介：LaCrO_3的nano粉末被一条大音阶的第五音胶化线路准备。从350～550K的LaCrO_3nano粉末的热能力被DSC方法测量并且是表示了:C_(p(LaCrO3))(±0.112)=166.844-8.500x10~(-3)T-1.022x10~6T~(-2)(J/(摩尔·K))(350-550K)。一个EMF测量集会为流电的房间作为电解质与CaF_2被开发。可逆房间的FrommeasuredEMF数据，(-)磅，La_2O_3，LaF_3，|CaF_2|O_2(1atm)，LaF_3，LaCrO_3，Cr_2O_3，磅(+)，和吉布斯的相关价值释放的O_2(1atm)精力，吉布斯LaCrO_3的形成的免费精力从700～885K被计算：ΔG_(f，LaCrO3)~Θ=-1555.364+0.354T(kJ/mol)(700-885K)。并且免费精力从简单氧化物La_2O_3andCr_2O_3反应改变的吉布斯是打算的是：ΔG_(f，公牛(LaCrO3))~Θ=-94.758+8.530x10~(-2)T(kJ/mol)(700-885K)。

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：［1］S.Jin,T.H.Tiefel,M.McCormack,etal.:Sci-ence,264(1994),p.413.［2］R.vonHelmolt,J.Wecker,B.Holzapfel,etal.:Phys.Rev.Lett.,71(1993),p.2331.［3］Y.Shimakawa,Y.Kubo,T.Manako:Nature,379(1996),p.53.［4］C.Zener:Phys.Rev.,82(1951),p.403.［5］A.J.Millis,P.B.Littlewood,B.I.Shraiman:Phys.Rev.Lett.,74(1995),p.5144.［6］A.J.Millis,B.I.Shraiman,R.Mueller:Phys.Rev.Lett.,77(1996),p.175.［7］D.Louca,T.Egami,E.L.Brosha,:Phys.Rev.B,56(1997),p.8475.［8］G.Zhao,K.Conder,H.Keller,etal.:Nuture,381(1996),p.676.［9］C.H.Booth,F.Bridges,G.J.Snyder,etal:Phys.Rev.B,54(1996),p.15606.［10］K.H.Kim,J.Y.Gu,H.S.Choi,etal.:Phys.Rev.Lett.,77(1996),p.1877.［11］S.Zhou,G.Zhou,Y.Zhang:Jpn.J.Appl.Phys.,38(1999),p.5075.［12］S.Tajima,A.Masaki,S.Uchida,etal.:J.Phy.C:SolidStatePhys.,20(1987),p.3469.［13］L.M.Rodriguez-Martinez,J.P.Attfield:Phys.Rev.B,58(1998),p.2426.

简介：超华科技（002288）2月20日晚间公告，根据《广东省著名商标认定和管理规定》和《广东省工商行政管理局关于广东省著名商标认定和管理的实施细则》的规定，经广东省著名商标评审委员会评审通过，公司“M”商标被延续认定为“广东省著名商标”，认定商品为“覆铜箔层压酚醛树脂板（绝缘材料）”，有效期自2013年3月24日起至2016年3月23日止。

简介：有5-8nm的尺寸的做Eu的GaOOHnanoparticles被热水的方法作为表面活化剂用钠dodecylbenzenesulfonate(SDBS)准备。做Eu的-Ga2O3和-Ga2O3被退火进一步制作GaOOH:Eu然后由X光检查衍射(XRD)描绘了，传播电子显微镜学(TEM)和光致发光(PL)。TEM结果显示出那monodisperse做Eu3+的GaOOHnanoparticles形式然后变换进通过退火的做Eu3+的-Ga2O3和-Ga2O3GaOOH:在600和900点的Eunanoparticles?????????????????@

简介：研究保温时间对0．98（K0.5Na0.5）NbO3-0．02LaFeO3（缩写为0．98KNN-0．02LF）无铅陶瓷相结构、显微组织、介电性能及铁电性能的影响。所有烧结样品均为纯的伪立方钙钛矿相，保温时间对相结构影响不大。随着保温时间的延长，样品的XRD衍射峰逐渐增强，并且向低角度移动。SEM观察结果显示，随着保温时间的延长，陶瓷样品的致密性提高，晶粒异常长大并出现孪晶结构。介电温谱表明，随着保温时间的延长，介电性能有所降低。电滞回线结果表明，2Pr随着保温时间的延长而增大的程度有所减小，而2E略有增加。在1150℃烧结2h得的到陶瓷的性能较优：εr=2253，tanδ〈5％，2Pr=34．51μC／cm2，2Ec=5．07kV／mm。

简介：TherelationshipofelectricalpropertiesofMn-dopedBa0.92Ca0.08TiO3PTCR(positivetemperaturecoefficientresistance)ceramicswithtwosinteringscheduleswasdiscussed.UsingTEM(transmissionelectronmicroscope)combinedwithEDS(energydispersiveX-rayspectrometer),theMnionsdistributedatgrainboundarieswereanalyzed.TheresultsshowthatthePTCReffectofMn-dopedPTCRceramicsismoredependentonthesinteringschedulethanthoseofMnfree.ThephenomenonmaybecausedbythevalencestatesvarianceofMnionssegregatedatthegrainboundaries.

简介：霍尔-埃鲁特铝电解槽需要一种新型的耐火材料来取代现有的凝固电解质构筑的炉帮。用两步烧结法制备的镁铝尖晶石作为潜在的候选材料，采用阿基米德排水法和扫描电镜研究镁铝尖晶石的致密化和晶粒长大。将所制备的试样在Na3AlF6-AlF3-CaF2-Al2O3电解质中腐蚀以评价其耐蚀性能。结果表明，用两步烧结法可制备高致密度（99.2%）和均匀显微结构的镁铝尖晶石。镁铝尖晶石对Na3AlF6-AlF3-CaF2-Al2O3电解质的腐蚀机理主要是镁铝尖晶石的溶解、氧化铝的形成和氟化物的扩散。两步烧结法制备的镁铝尖晶石具有良好的耐Na3AlF6-AlF3-CaF2-Al2O3电解质腐蚀性能。

简介：本文对比分析了氮基保护气氛和真空两种热处理加热介质对300M钢疲劳性能的影响，并研究了热处理后表面喷丸强化对300M钢疲劳性能的改善情况。结果表明，由于氮基保护气氛热处理后表面层有一定程度的氧化脱碳，故钢的疲劳极限比真空热处理的低近30％；由于喷丸强化后表面形成较大的压应力，消除了表面氧化层等不良影响，氮基保护气氛热处理后经喷丸的300M钢疲劳极限比未喷丸的提高约40％。

简介：5月11日，美国商务部公布：2011年1～3月美国未加工精炼铅出口总计3844吨，其中3月未加工精炼铅出口总计为848吨，环比下降70％，同比下降87.9％。另外，美国1～3月铅进口总计36876吨，其中3月铅进口13624吨，环比增加15．9％，同比下降10．0％。

简介：以MoO3粉、Mo粉、Si粉及Al粉为原料,采用机械合金化法合成了纳米Mo5Si3-20%Al2O3(质量分数)复合粉体。采用XRD、SEM、TEM和DTA等对复合粉体在球磨过程中结构变化进行了研究。结果表明:球磨10h后合成的Mo5Si3-20%Al2O3复合粉体,反应以爆炸模式进行。球磨30h后,Mo5Si3和Al2O3的晶粒尺寸分别为36.3nm和21.9nm。随着球磨时间的延长,Mo5Si3和Al2O3的晶粒尺寸变小,衍射峰宽化程度降低。DTA和XRD分析结果表明,复合粉体具有好的热稳定性,球磨30h后再在1000℃退火1h后复合粉体没有发生物相转变。更多还原

简介：采用固相法制备La2O3与Sb2O3掺杂的钛酸锶钡陶瓷，研究其介电性能及相变特性。通过X射线衍射法分析体系微观结构并利用扫描电镜观察其表面微观形貌。（La,Sb）共掺杂的钛酸锶钡陶瓷具有典型的钙钛矿结构，且随着Sb2O3掺杂量的增多其平均粒径显著减小。La3＋离子以及Sb3＋离子均占据钙钛矿晶格的A位。La2O3与Sb2O3添加量的改变显著影响钛酸锶钡基陶瓷的介电常数以及介电损耗。La2O3改性的钛酸锶钡陶瓷其四方-立方相变为二级相变，且居里温度随着La2O3掺杂量的增多向低温方向移动。（La,Sb）共掺杂的钛酸锶钡陶瓷则体现为弥散相变，随着Sb2O3含量的增大而偏离居里－外斯定律越显著。由于Sb3＋离子对晶格原位离子的取代使得（La,Sb）共掺杂的钛酸锶钡陶瓷的介电常数最大值下的温度亦随着Sb2O3含量的增大而降低。

简介：Luminescentpolystyrenemicrosphereswereeasilyfabricatedfrompoly(styrene-co-methacrylicacid)andaqueousRE(III)chloridesolution(RE=Eu,Tb)inthepresenceof2,20-bipyridineassecondligand.Thenegativechargesofcarboxylgroupsonthesurfaceofmicrospherescoordinatedwithrareearthionsatfirst,suchascomplexescovalentlylinkedto2,20-bipyridine,resultinginstrongphotoluminescence.Variousmethods,includingtransmissionelectronmicroscope(TEM),scanningelectronmicroscope(SEM),energydispersivespectroscopy(EDS),Fouriertransforminfraredspectroscopy(FT-IR),andfluorescencespectrophotometer,wereusedtocharacterizetheresultantpolystyrenecompositemicrospheres.Thisworkhighlightstheideathatitisfaciletosynthesisluminescentmicrospheresbysurface-modifiedmethoddirectly.