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：ＳｃａｎｎｉｎｇＥｌｅｃｔｒｏｎＭｉｃｒｏｓｃｏｐｙＳｔｕｄｉｅｓｏｆＹＢａ＿２Ｃｕ＿３Ｏ＿（７－δ）ＳｕｐｅｒｃｏｎｄｕｃｔｏｒｓＳｈａＷｅｉ（沙维）（ＤｅｐａｒｔｍｅｎｔｏｆＣｉｖｉｌＥｎｇｉｎｅｅｒｉｎｇ，ＴｈｅＱｕｅｅｎ′ｓＵｎｉｖｅｒｓｉｔ...

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

简介：高质量的取向附生的YBa2Cu3O7-(YBCO)超导的电影被制作在上(OOl)用直流的劈啪作响方法的LaAlO3底层。不平常地高的电影厚度的成就(多达2.0嗯)没有microcracking，部分地被归因于毛孔的存在在这些电影与充满钇的作文相关。微观结构上的电影厚度的影响被X光检查衍射调查常规扫描(-2,-scan,杆数字)和印射的高分辨率的相互的空间。电影是没有直到2m的厚度的a-axis-oriented谷物面向的c轴。表面形态学和批评当前的密度(Jc)强烈取决于电影厚度。而且，为这些厚度依赖的原因详细被阐明。

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：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：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：在这份报纸，纺纱冰上的无磁性的Y离子的冲淡效果加重Dy2Ti2O7由红外线并且拉曼系列和磁化大小被调查。与温度弄软减少的异常声子在父母被发现并且冲淡除了之外，做的混合物，和Y能放松弄软声子233附近的红外模式?厘米<啜class=“a-plus-plus”>显示在纺纱冰材料联合的强壮的phononphonon的1,。当冲淡的水平不很高时，磁化大小表明无磁性的杂质严重地不处于扎根的状态影响纺纱冰规则。然而，大量冲淡提高混乱并且因为集体旋转扭动簇不再是可得到的，打破纺纱冰状态。

简介：反的尖晶石类型金属氧化物，magnesium-manganese-titanium氧化物(Mg2Mn0.5Ti0.5O4)，用coprecipitation/thermal结晶化方法被准备。有这材料的抽取/插入反应被X光检查，交换的浸透能力，pH滴定，和分发系数(Kd)测量调查。Mg2Mn0.5Ti0.5O4的酸处理引起了Mg2+超过81%的抽取，而Mn4+和Ti4+的溶解是不到10%。试验性的结果证明酸处理的样品有交换56mg的一个能力

简介：ＥｌｅｃｔｒｏｃｒｙｓｔａｌｌｉｚａｔｉｏｎＭｅｃｈａｎｉｓｍｏｆＴｕｎｇｓｔｅｎｉｎＭｏｌｔｅｎＫＦ－Ｂ＿２Ｏ＿３－Ｋ＿２ＷＯ＿４ＷｅｎＺｈｅｎｈｕａｎａｎｄＬｉＧｕｏｘｕｎ文振环，李国勋（ＧｅｎｅｒａｌＲｅｓｅａｒｃｈＩｎｓｔｉｉｕｔｅｆｏｒＮｏ...

简介：BasedonthetechniqueforpreparingLaCl3viadirectpyrolysisofrareearthchloridesolution,ajetpyrolysisreactorwasdesignedandtheintra-reactortemperatureandchemicalreactionswerenumericallysimulatedusingcomputationalfluiddynamics(CFD)technique.Theresultsshowthattheflowratevariationatthefuelinletdoesnotlargelyaffectthetemperatureinthereactor,whiletheincreaseinexternalpressureatthematerialinletrapidlydecreasestheaveragetemperature,Venturitemperature,andoutlettemperature.TheCH4andO2insidethereactorarecombustedcompletely,andwhenthematerialinletpressureis\90Pa,theLaCl3isfullypyrogenated.ThecontentsofCO2,La2O3,andHClfluctuateneartheVenturitubeandfinallystabilize.La2O3contentattheoutletisinatop-to-bottomgradient.

简介：Thecorrosionbehaviorandanti-corrosionmechanismoftheZn-Ni-Al2O3compositecoatingwereinvestigatedbySEM,EDSandXPS.TheresultsindicatethatthecorrosiontypeoftheZn-Ni-Al2O3coatingsinneutral5wt.%NaClsolutionisuniformcorrosion.ThepresenceofcompactanduniformlydispersednanoaluminaparticlessubstantiallyinhibitsthecorrosionofZn-Ni-Al2O3compositecoatings.Intheinitialcorrosionstage,thecorrosiveproductsofZn-NimatrixformacompactZnCl2·4Zn(OH)2layer.Withthedevelopmentofcorrosion,somenanoaluminaparticlesareembeddedandformaNienrichmentlayer.InNienrichmentlayer,NipresentsasNiandNiO.

简介：研究LiNi0.5Mn0.5O2电极在LiNO3水溶液中的电化学行为，同时分析该电极在不同pH值电解液中的循环衰减原因。循环伏安测试显示LiNi0.5Mn0.5O2在浓度为5mol/L的LiNO3水溶液中具有较好的锂离子脱嵌能力。对比发现，LiNi0.5Mn0.5O2电极在浓度为5mol/L，pH值为12的LiNO3水溶液中具有最好的循环稳定性能。通过交流阻抗法、X射线衍射分析及电极形貌的对比分析发现：电极在浓度为5mol/L，pH值为12的LiNO3水溶液中循环时，电极的表面形貌和电极结构都能得到较好的保持，电极的电荷传递阻抗得到明显抑制，因此在该pH值电解液中的循环稳定性最好。

简介：微米大小的Sr2(P2O7):Ce，Tb绿黄磷被与它的先锋在不同温度被退火准备综合了由一同沉淀(NH4)在周围的温度的2HPO4。黄磷的阶段结构，谷物尺寸，表面形态学，和光性质被X光检查衍射调查，扫描电子显微镜，传播电子显微镜，和荧光光谱。先锋的产品在1,100点退火了的结果表演??‰浮???匠??伲?????畅？？

简介：TheeffectofyttriaonthesolidreactionmechanismofaCaHPO4·2H2O+CaCO3systematdifferenttemperatureswasexperimentallystud-ied.Thesampleswithandwithoutyttriaweresubjectedtothermogravimetric/differentialscanningcalorimetrymeasurement.ThesampleswereheattreatedatthetemperaturescorrespondingtothepeaksontheDSCspectra,andtheresultedphasecompositionswereidentifiedbyX-raydiffraction.Thetransformationmechanismwasdeducedbycomparingthephasesobtainedatdifferenttemperatures.Theresultsshowthatthetransformationsatbelow1073Karenotaffectedbyyttria,butallthoseatabove1073Karecompletelyaltered.Theformationtem-peratureofhydroxyapatitedecreasesby134K,andthedecompositiontemperatureincreasesby38K.ThepolymorphoustransformationofCa3(PO4)2fromβphasetoαphaseincreasesby47K.Thethermodynamicpropertiesofthetransformationsatabove1073Karealsomodi-fiedbytheadditionofyttria;thatis,theendothermalpeaksaresubstitutedbyexothermalpeaks.

简介：

简介：HotcompressionbehaviorofTiC–Al2O3/AlcompositeswasstudiedusingtheGleeble-1500systematatemperaturerangeof300–550°Candatstrainraterangeof0.01–10.00s-1.TheassociatedstructuralchangeswerestudiedbyTEMobservations.Theresultsshowthatstressleveldecreaseswithdeformationtemperatureincreasingandstrainratedecreasing,whichcanberepresentedbyaZener–Hollomonparameterinanexponent-typeequationwithhotdeformationactivationenergyQof172.56kJ·mol-1.Dynamicrecoveryoccurseasilywhenstrainratesarelessthan10.00s-1.Dynamicrecrystallizationcanoccuratstrainrateof10.00s-1.

简介：利用高频辅助激光熔覆技术在镍基合金上制备Al2O3-13%TiO2（质量分数）陶瓷涂层。采用SEM、XRD和EDS等方法分析陶瓷涂层的微观结构和陶瓷层与粘结层之间的结合界面。结果表明：陶瓷层出现了完全熔化区和液相烧结区双层结构,其中,完全熔化区颗粒充分烧结长大,而液相烧结区则出现了三维网状结构,该三维网状结构由熔化的TiO2相包裹Al2O3颗粒形成。通过激光熔覆作用下的粉末熔化和扁平化行为解释双层结构形成机理。同时,在陶瓷层与粘结层的结合界面上发现具有尖晶石结构的NiAl2O4和针状结构的Cr2O3,证明在激光熔覆过程中发生的化学反应可以有效增加陶瓷层与粘结层的结合强度。

简介：ExtractingB2O3fromcalcinedboronmud(CBM)wasstudied.TheeffectoffactorssuchasreactiontemperatureandNaOH-to-CBMmassratioonB2O3extractionefficiencywasinvestigated.TheresultsshowthatincreasingreactiontemperatureandNaOH-to-CBMmassratioincreasesB2O3extractionefficiency.TherearetwostagesfortheB2O3extractingprocess:0–20ministhefirststage,whichisrapid;20–50ministhesecondstage,whichisslowerthanthefirststage.Theoverallextractingprocessfollowstheshrinkingcoremodel,andthefirstandsecondstagesaredeterminedtoobeythesurfacechemicalreactionmodelandthediffusionthroughtheproductslayermodel,respectively.Theactivationenergiesofthefirstandsecondstagesarecalculatedtobe41.74and15.43kJ·mol-1,respectively.TheB2O3extractingkineticsequationsofthefirstandsecondstagesarealsoobtained.

简介：结构和绝缘的性质(Pb，Sr)有不同Pb和Sr内容的Nb2O6-NaNbO3-SiO2眼镜陶艺被调查。没有Sr替换的眼镜陶艺的XRD模式与Sr替换与那不同，它在后者显示斜方晶的阶段的存在。，TEM明亮的地观察与Sr为样品显示出nanosized微观结构，与分开的使结晶的乐队一起的典型最容易溶解的微观结构在玻璃矩阵被发现。当到Pb的Sr的臼齿的比率是4时，样品的绝缘的性质测量显示绝缘的常数，绝缘的损失，DC地和绝缘的常数的温度依赖的明显的改进?6。