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简介：ThemeasurementsoftemperaturedependenceofthemagneticsusceptibilityofLa1-xSrxCoO3perovskiteoxidesatdifferentSrdoping(0≤x≤0.5)andannealingtemperaturewerepresented.Forthesamplewithx=0.1,ashoulderwasobservedaround150K,andapeakwhichisonefeatureofspinglassappearedaround50Kinthecurveofsusceptibilityversustemperature.Thehigh-temperature(250～420K)susceptibilityfitswellwithCurie-Weisslawforallsamples.WeissconstantandeffectivemagneticmomentweredeterminedandtheirvariationswithSrdopingandoxygenannealingconditionwereobtained.TheWeissconstantincreasesmonotonouslywithSrcontentforx>0.2.Thevaluesofeffectivemomentswereinterpretedwiththespinstateofcobaltions.Studiesonthesusceptibilitiesofthesampleswithx=0.2underdifferentpreparationtemperaturesandannealingtemperaturesshowthattherisingofsinteringtemperatureandannealingtemperaturewillincreasethepara-ferromagnetictransitiontemperature,andreducetheeffectivemomenttonormalvalue.OurresultshowsthatbothCo3+andCo4+ionsshouldbeinISstateafterannealingandtheoxygenannealingcausesthetransitionofCo3+spinstatefromHStoIS.

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：Duetotheremarkablemagnetoresistance(MR)effectonperovskite-typemanganite,magnetoelectronicsandspintronicshavebecomeattractivesubjectsofexperimentalandtheoreticalinvestigationsfortheapplicationpurpose.(La0.9Nd0.1)2/3Ca1/3Mn1-xFexO3(x=0,x=0.05)werepreparedsuccessfullybysol-gelmethod.Thestructure,magneticproperties,andtransportpropertiesofthecompoundswereinvestigated.Themagnetoresistanceeffectdependsonthecompositionandthetemperature.XRDpatternsshowthatthecompoundisasinglephasepolycrystalwithpseudocubicstructure.Alargenegativeisotropicmagnetoresistanceeffectinthesampleswereobservedatlowtemperatureregion.ThemaximumMRofthesampleswas77%and97%,respectively.Itwasmostlikelyduetothescatteringorthetunnelingtransportofspin-polarizedcarriersinlatticeunderstrongmagneticfield.

简介：ThemagneticpropertiesandthephasestructureofTb1-xPrxFe1.96(x=0,0.1,...,0.7)werestudied.ItisfoundthatthesaturationmagnetizationoneasyaxisisdecreasedwithincreaseofPrcon-tent,from77.24Am^2·kg^-1forx=0,reducestominimumvalueof11.84Am^2·kg^-1forx=0.5,andreturnesto37.14Am^2·kg^-1forx=0.7.Thenon-cu-bicphasesappearbeyondx=0.2andthematrixchangesfrom1:2phaseforx=0to1:3phaseforx=0.4,atlastto2:17phaseforx=0.7.Thecom-poundsstructurewouldturnmorecomplexasthePrcontentincreases.

简介：该文筒述了管线钢的市场状况，X60、X65、X70技术要求，生产难点、工艺流程，酒钢生产设备、前期开发情况，对洒钢开发管线钢X60、X65、X70板卷的可行性进行了分析。

简介：ThetransportpropertieswerestudiedforrareearthmanganeseoxideLa0.67Cao.33Mn1-xFexO3(x=0-O.3)systems.ItisfoundthatwithincreasingFe^3+-dopingcontentx,theresistanceincreasesandtheinsulator-metaltransitiontemperature(T1M)shiftstolowertemperature.Ifthedopingcontentissmall,thetransportpropertiesmanifestmetalliccharacteristicsinthetemperaturerangeofT＜T1M,whiletheywillobeyathermalactivationmodelinthetemperaturerangeofT＞T1M.SuchabehaviormaybeattributedtotheFe^3+-dopingandpossibleMnionsscatteringtoelectrons.TheFe^3+dopingmayleadtotheformationofFe^3+-O^2--Mn^4+channels,whichcouldterminatethedoubleexchangeMn^3+-O^2--Mn^4+channels.TheantiferromagneticclustersofFeionsmayinducetheMnionstoscettertotheelectrons.

简介：以钛粉,硅粉和石墨粉为原料,采用放电等离子烧结技术制备密度为4.14g/cm^3的Ti3SiC2和密度为4.03g/cm^3的0.8Ti3SiC2＋0.2SiC复合材料,并以此为基础制备Ti/Ti3SiC2/0.8Ti3SiC2＋0.2SiC层状材料。通过扫描电镜（SEM）和X射线衍射仪（XRD）分析材料的显微结构与相组成。结果表明：该层状材料的界面结合紧密,没有明显的孔洞、裂纹等缺陷,各层的相组成符合设计要求。经800℃热处理40h后Ti/Ti3SiC2界面处生成稳定的TiC层,在高温下该层状材料的界面基本稳定。

简介：NominalcompositionofCa1-xZnxTiO3:0.002Pr3+(x=0.000～0.200)phosphorswerepreparedbyconventionalsolidreactionroute.XRDandPLmeasurementswereusedtoinvestigatethesolid-solutionstructureandluminescencepropertiesofZn-dopedCa1-xZnxTiO3:0.002Pr3+phosphors.Theeffectofsolid-solutionstructureformedbysubstitutionbetweenCa2+andZn2+ionsontheluminescentpropertieswasanalyzed.Theresultsrevealthat,withtheincreaseofZnsubstitutioncontentbelow0.010,latticeparametersandtheintensityofexcitationpeakatboth260and330nmaswellasthecorresponding610nmemissionintensityaremonotonouslydecreasedquicklyinasimilartendency.Also,theevolutionofluminescenceintensityandcrystalcellparametersagainstZndopingconcentrationareingoodagreement.AboveresultsarecloselyrelatedwiththestructurechangewithinCa1-xZnxTiO3:0.002Pr3+solid-solutionphaseformedbytheZnionssubstitutionfortheCasites.Presentstudyrevealsthatthesolid-solutionstructureformedbysubstitutionbetweenCa2+andZn2+ionshassignificanteffectontheluminescencepropertiesofsinglephaseCa1-xZnxTiO3:0.002Pr3+phosphors.

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.

简介：CeO2andCuOx-CeO2supportedpotassiumcatalystsweresynthesizedbywetnessimpregnationmethod.ThecatalystswerecharacterizedbyBET,NO-TPO,NOx-TPDandsoot-TPOmeasurements.Bythedecorationofpotassiumandcopper,themaximumsootcombustiontemperatureoftheceria-basedcatalystdecreasedto338and379°CinthepresenceandabsenceofNOunderaloosecontactmode,re-spectively.ThepronouncedlyenhancedNOoxidationabilitybycopperintroductionandNOxstoragecapacitybypotassiummodif...

简介：BasedonAPISTD1104-2005andCSAZ662-2007,fieldgirthweldingtestsandgirthweldabilityevaluationswereexecutedforthreetypesofwallthicknessX70UOEpipeline,inwhichthemostpopularmainlinegirthweldingmethod,single-wireautomaticgasmetalarcwelding(GMAW),wasused.Theweldingprocedurespecificationwasoptimizedtoachieveagoodqualityandcold-crack-freegirthweldjointwithoutpreheatingorpost-weldheattreatment.Inaddition,porosities,inclusions,andincompletefusiondefectswereavoided.Thetensilestrength,bending,Vickershardness,CharpyV-notchimpacttoughness,andcracktipopeningdisplacementfracturetoughnessofthegirthweldjointwereevaluated,andthejointexhibitedgoodmechanicalperformance.Thus,thefieldgirthweldabilityofBaosteel’sX70UOEpipelineisexcellentforautomaticGMAW.

简介：采用玻璃化试剂，于铂黄坩埚中，在高温下熔融金川高锍，冷却成形，实现了金川高锍中镍、钴、铜、铁的Ｘ－荧光测定。

简介：用溶胶-凝胶法制备镍锌共掺杂Z型锶钴铁氧体Sr3（NiZn）xCo2（1-x）Fe24O41（x=0～0.5）粉末。用X射线衍射（XRD）和扫描电镜（SEM）表征该铁氧体粉末的晶体结构和表面形貌，并测试其室温磁滞回线和室温电阻率。用微波矢量网络分析仪测定该粉末在2～18GHz微波频率范围的复介电常数和复磁导率，根据测量数据计算电磁损耗角正切及微波反射率，分析该材料的微波吸收性能与电磁损耗机理。结果表明：Sr3（NiZn）xCo2（1-x）Fe24O41粉末呈六角片状形貌，晶体结构为Z型，具有良好的软磁特性；x=0.3时该材料的电阻率最低，微波吸收效果最好，在13.5GHz频率的吸收峰为25.1dB，10dB频带宽度为7.7GHz，兼具强的磁损耗和弱的介电损耗。

简介：Whitelight-emittingYVO_4：1mol.%Dy~（3＋）,xmol.%Eu~（3＋）phosphorpowderswithordermorphologyandwellcrystallizationwerehydrothermallysynthesizedat180°C.Themicrostructure,white-lightemission,andlight-emittingmechanismofthepowderswerecarefullystudiedusingX-raydiffractometry,scanningelectronmicroscopyandphotoluminescencespectra.TheexcitationandemissionspectraofthephosphorpowdersindicatedthecoexistenceofefficientenergytransferfromEu~（3＋）toDy~（3＋）andinefficientenergytransferfromDy~（3＋）toEu~（3＋）besidestheenergytransferfromVO_4~（3–）toEu~（3＋）.IncreasingtheEu~（~（3＋））concentrationinitiallyenhancedandthenweakenedtheluminescentintensityofDy~（3＋）.Thewhite-lightemissionsofYVO_4：1mol.%Dy~（3＋）,xmol.%Eu~（3＋）phosphorpowderswerebothrelatedtotheenergytransferbetweenVO_4~（3–）andDy~（3＋）/Eu~（3＋）,aswellasbetweenEu~（3＋）andDy~（3＋）.TheinefficientenergytransferfromDy~（3＋）toEu~（3＋）wasfirstfound.

简介：采用Ｘ射线荧光光谱法测定新疆高冰镍中铁、钴，加入适量的助碎剂，利用基体中其它元素参与校正，实现了未知样品的测定。

简介：对管线钢表面的夹渣缺陷进行了金相和电子探针分析。结果表明,钢板表面缺陷有保护渣的痕迹,有可能是炼钢过程中的保护渣掉入钢水中造成的,也有可能是板坯在加热过程中加热炉耐火材料崩裂落到钢坯表面造成的。

简介：High-strengthpipelinesteelandlargediameterlinepipesareoftenusedtoincreasethecapacityoftransportationandreducethecostassociatedwiththeconstructionandoperationoflong-distancegaspipelineprojects.China’sinitiativestoconstructlong-distancenaturalgaspipelineshasbroughtinnewopportunitiesforthedevelopmentofX80linepipes.BaosteelhasdesignedtheoptimumchemicalcompositionofX80withhighniobiumandlowmolybdenumcontent.Inaddition,aweldingexperimentalplatformandafiniteelementmodel(FEM)havesupportedthedevelopmentofX80UOEpipesinanefficientandeconomicalway.TheapplicationandrecentdevelopmentofX80UOEpipeswereintroducedinthispaper.TocomplywiththerequirementsoftheSecondWest-EastGasPipelineProject(2ndWEPP),X80pipelinesteelwithlowcarbonbainitemicrostructurewasdevelopedbyutilizingtheoptimizedcompositionandTMCPprocess.Thematchingweldingmaterial,weldingprocedureandUOEformingprocessesfor1219mmoutsidediameterX80UOEpipeswerealsodeveloped.Morethan340000tofX80UOEpipeswereproducedandappliedinthe2ndWEPP.Furthermore,tomeettheprospectivedemandforlong-distancegaspipelineswithanannualtransportationcapacityofover40billionm3,largersizeX80UOEpipeswith1422mmOD×30.8mmWTweretrialproducedrecently.DWTTperformance,themaintechnicalchallengeforheavierwallpipes,wasimprovedbyusingoptimizedmicrostructuraldesign.ThenewlydevelopedX80pipescanbepotentiallyusedforlargertransportationcapacitypipelinesinChina.

简介：通过合理的成分设计,采用洁净钢冶炼工艺、两阶段轧制技术、热处理生产技术,成功的研制出符合客户要求的正火态热处理管线钢。通过性能检验,产品晶粒细小、组织均匀、性能富裕量较大,完全可以满足用户大批量供货要求。

简介：研究了不同的轧制工艺和冷却工艺对厚规格管线钢X65的综合性能和组织的影响。结果表明:较高的Ⅱ阶段开轧温度和较快的冷却速度可以使X65得到以针状铁素体和粒状贝氏体为主的组织,钢板的强度和落锤等性能可以满足要求。