简介：(1-x)La_(0.67)Ca_(0.33)MnO_3/Cr_2O_3(LCMO)+xCr_2O_3composites被一个新液相方法综合。XRD和SEM大小表明在LCMO结构和LCMO的晶格常数可溶的很少Cr_2O_3几乎没变化，当大多数Cr_2O_3在谷物边界或在LCMO谷物的表面上是分布式的时。Inresistivity对温度大小，金属--绝缘体转变被观察什么时候x<0.20。抵抗力增加和金属--绝缘体转变温度与Cr_2O_3的增加的内容减少。一个随机的电阻器网络(KRN)模型被使用，到模仿混合样品的运输性质。模拟结果同意试验性的观察。结果证明方法为理解maganite的composites的电子运输是合理的。

简介：ThetransportpropertiesintheLa2/3(Ca1-xSrx)1/3MnO3(x=0,1/3,2/3)filmspreparedusingtheRFmagnetronsputteringmethodwereinvestigated.TheeffectoftheCa,Srdouble-dopingattheApositionintheLa2/3A1/3MnO3onthestructureofthetargetsandtransportofthefilmshasbeenstudied.Withtheincreaseofx,thestructuresofthetargetstransformfromtherhombohedralphasetothecubicphase;themetal-insulatorphasetransitiontemperature(Tp)ofthefilmsincreases;andthecorrespondingpeakresistivitydecreases.Allthephenomenacanbequalitativelyexplainedbythelatticeeffect.

简介：Ca_3Co_2O_6，Na和Ni的电子结构做了模型被被基于的Camhride连续全部的精力包裹(CASTEP)的量化学药品软件学习，在密度函数理论(DFT)和伪潜力上。优点(Z)的电子传导性，seebeckcoefficient，热传导性和图被计算。精力乐队结构在做semiconductors.Na的模型shoivs由于代理杂质揭示杂质层次的形式p类型半导体的特性，而是做Ni的模型是n-typesemiconductor。计算结果证明做的模型的电的传导性比的高非--做的模型，当Seebeck系数和做的模型的热电导率是比非做的那些低的时。因为大增加，电的电导率，做Na的模型的Z被提高，热电的性质被改进。作为Seebeck系数的大衰落，在另一方面，Ni-的Z做了模型不到的非--做的模型。

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简介：TherepresentativesampleLa0.58Dy0.09Ca0.33MnO3ofDydopedLa0.67Ca0.33MnO3rare-earthmanganiteswasinvestigated.ThemostimportanteffectofDydopingistointroducethemagnetoimpurityandformthespinclusterswhichinducedramaticallylargeCMRinLa0.58Dy0.09Ca0.33MnO3.Thefittingresultsoffield-inducedresistivitydecreasetotheBrillouinfunctionindicatethattheCMRiscausedbythespindependenthoppingbetweenspinclusters.Itisthemagneticfieldthatreducesthesizeofspinclustersandinducesafield-inducedirreversibleCMRbehaviour.

简介：用溶胶-凝胶法制备了系列掺杂（La0.8Ln0.2）2/3Ca1/3MnO3（Ln=La，Ce，Pr，Nd，Sm，Eu）纳米级晶体。对比在La被其它镧系元素部分替代后，引起的A位离子平均半径的改变和磁矩变化对电输运及磁阻性能的影响，实验分析表明，各个样品在同样大小磁场下的磁电阻存在较大的差别，样品的磁电阻随原子序数的增加而明显变大，由镧系收缩引起晶格畸变所产生的本征磁电阻占主导地位，随着外加磁场的增加，不同掺杂样品间的峰值电阻差异被弱化；各掺杂样品间的转变温度差与掺杂离子半径差和磁矩差密切相关，且离子半径的差异对转变温度的改变贡献更大。

简介：Throughmeasuringthecoefficientoflinearexpansion,thestructureandpropertiesoftheLi2O-Al2O3-SiO2lowexpansionglassceramicscontainingB2O3arestudiedbyJRandXRD.ItisshoutnthattheIRmethodisefficientinthestudyoftheglass-ceramicsstructure.Thereisa"Boronabnormality"inthesystemwhichhasanimportantinfluenceonthepropertiesoftheglass-ceramics.

简介：SiO2-B2O3-Al2O3-CaO在低sintering温度使契约成玻璃，高力量被讨论。FTIR和XRD分析被用来与铝的不同内容描绘基本使成玻璃的契约的结构。弯曲力量和热扩大系数也被测试。同时，在660光线衍射(XRD)的sintering温度的合成标本的微观结构，扫描电子显微镜(SEM)分析和其它工具。结果证明分别地，钾和磷的溶解率在95.64wt%lessthan的一种谷物尺寸的条件下面是70wt%和93.7wt%0.074公里，9.78gg-1硫磺的酸，0.5gg-1铵氟化物，160桴???瑳畲瑣牵獥椠?慭湩慴湩摥映吗？？

简介：TheRamanspectraof3%(molefraction)Y2O3-ZrO2(3Y)areobtainedatdifferenttemperaturefrom77Kto853K.Theresultsshowthat260cm-1Egand460cm-1Egmodesonthespectrashifttowardlowerwavenumberwiththeincreaseoftemperature;meanwhile,thecontinuityoftheHalfWidthatHalfMaximum(HWHM)andwavenumber(frequency)ofRamanbandsarebrokenandt-phaseonlypartiallytransformstom-phaseat523K.Basedontheexperimentalresults,thispaperdiscussesthet-phaselatticevibrationof3YandpresentstheimagesofvibrationdisplacementofsixRaman-activemodesfort-phaseofZrO2.TheanalysisindicatesthattherearediversitiesexistinginthedisplacementoftheatomicvibrationofRaman-activemodesbecauseoftheirdifferentsymmetriesatvarioustemperature,whichleadstothedifferentchangetendenciesofRamanbands.Furthermore,theabruptchangesofsomeRaman-activemodesindicatingtheatomicdisplacementareassumedtobethecondensationsofphononmodesinthet→mphasetransition.

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简介：采用传统的固相反应法在不同的氧压下烧结制得Ca3Co4O9样品，并对其进行了结构和热电性能表征。经研究发现，在氧气环境下烧结样品可以抑制Ca3Co4O9在高温下分解，提高其烧结温度。在氧气环境中烧结的样品成相优于在空气中烧结的样品。一定氧压下烧结样品的电阻率比常压下烧结样品的电阻率大，但是Seebeck系数明显提高，因而改善了Ca3Co4O9的热电性能。

简介：以便得到TiB2-Al2O3的同质的混合物和协议，一个表面修正方法被用来准备nano规模的杂交Al2O3涂的TiB2粒子。PE蜡粒子是第一到由杂交，然后nano规模Al2O3粒子的TiB2粒子上涂又是涂的到由PE蜡粒子涂的TiB2的表面上。SEM，TEM和版本被用来描绘同样收到的核心/壳粒子和它的协议的微观结构。试验性的结果显示出那粒子规模TiB2和Al2O3的同质的分散能不仅在混合粉末而且在使脱蜡的协议被形成。协议当时是由煤气压的sintering(GPS)的sintered。物件顶端的装饰物产品显示出与参考样品由正常方法制作了作比较的改进技工性质。

简介：以超重力场辅助燃烧合成技术制备了呈梯度分布的Y2O3-Al2O3-SiO2玻璃／Y3Al5O12陶瓷梯度复合材料。结果表明，梯度布置两种组分的原料既可防止下层熔体的喷溅，又能提高上层玻璃的透过率。该梯度材料沿超重力方向依次为YAS透明玻璃层、YAS-YAG玻璃陶瓷层和YAG陶瓷层。

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简介：Inordertorealizetheco-firingwithAg/Pdelectrodesinmultilayerdevices,Pb(Zn1/3Nb2/3)1-,-yZrxTiyO3(0.25＜x＜0.35,0.25＜y＜0.35)piezoelectricceramics(hereafterdesignatedPZN-PZT)modifiedbyLa2O3hasbeenpreparedbyconventionaltechniquewithsinteringtemperaturefrom1100℃to1140℃.X-raydiffractionpatternsdemonstratedthatpureperovskitephasewasobtained.Secondaryelectronimage(SEI)showedthatcrystallinegrainsinceramicswerewellgrown.d33ofmanufacturedsamplewasashighas560×10-12C/N.kpwasabout0.61andtgδabout30×10-3.TheexistenceofliquidphaseexaminedbyelectrondiffractioninPZN-PZTsampleisbeneficialtosinteringoftheceramic.

简介：TheantibacterialeffectofcarryingsilverB2O3-SiO2-Na2Oglassmaterialwasstudiedbymeansofantibacterialring,nephelometery,MICvalue,thinfilmattachmentandmicrocalorimetry,respectively.TheexperimentalresultsoffivekindsofantibacterialtestmethodsarealmostidenticalandcanverifythatcarryingsilverB2O3-SiO2-Na2Oglassmaterialexertsanexcellentantibacterialperformance.Antibacterialringandnephelometeryaresimple,quick,buttheprecisionisrestrictive.MICvalue,thinfilmattachmentmethodandmicrocalorimetrycanquantitativelycomparetheantibacterialeffectsoftheantibacterialglassmaterial.Comparedwiththetraditionalmicrobetestmethods,themicrocalorimetrycananalyzetheinhibitingeffectofthecell'sgrowthandmetabolismontheantibacterialglassmaterialbymonitoringthethermaleffectcontinuouslyandautomatically.

简介：Theimplantedionrange,thedepthprofileandthefilmsttuctureoftheimplantedlayerwerestudied;thecarrierconcentrationandthemobilityweremeasured;theconductivitymechanismofthefilmimplantedFeintoAl2O3ceramicwasdiscussed.TheconclusionisthattheimplantedFe2+ionsmoveintoAl2O3latticeandreplaceAl3+toformsubs-titutionimpuritiessothattheionimplantedlat-tice,ascomparedwiththeoriginalone,presentsaneffectivenegativechargewhichformsanegativechargecenter.Avacancyisboundarroundit,andanacceptorisintroducedintheforbiddenband.

简介：Thevolatilizationkineticsofantimonytrisulfideinsteamatmospherewasstudiedwiththermogravimetryattemperaturesfrom923to1123K.Atheoreticalmodelwasdevelopedtocalculatetheoverallrateconstantandthemasstransfercoefficientingasphases.Theexperimentalresultsshowthatthevolatilizationrateisenhancedwithincreasingtemperatureandsteamflowrate.Thevolatilizationrateismainlycontrolledbythemasstransportingasphases.Theapparentactivationenergyfortheprocessisfoundtobe59.93kJ/mol.ItisdemonstratedthatSb2S3isdominantlyoxidizedintoSb2O3andH2Sbywatervaporinthevolatilizationprocess.Someantimonymetalisformed.Thereactionmechanismisdiscussedinaccordancewithexperimentaldata.

简介：TiB2ceramicspowderwassynthesizedfromB2O3-TiO2-Mgsystem.TheeffectsofTiB2additionasdiluentonthecombustionsynthesisprocesswereinvestigated.TheresultsofthermodynamiccalculationandexperimentsshowthattheincreaseofTiB2contentrangingfrom0to20wt%canreducetheadiabatictemperatureTadfrom3100Kto2896KandcombustiontemperatureTcfrom2139Kto1621Krespectively.TheparticlesizeandhalfwidthoftheparticledistributionarealsoincreasedwiththeadditionofTiB2increasingfrom0to20wt%.ThecombustionproductisamixtureofTiB2,MgO,andotherintermediatephases.TheleachedproductcontainsmainlyTiB2,TiO2andTiN,anditsoxygencontentis7.77wt%.