简介:概述了现有非晶合金的种类,并从合金的热力学、动力学和结构3个方面阐述了合金的非晶形成机理,同时全面总结和探讨了表征合金非晶形成能力的各种参数,主要包括Inoue经验规律、△H(熔化焓)、△S(熔化熵)、过冷液体温度区间△Tx(△Tx=Tx-Tg)、约化玻璃转变温度Trg(Trg=Tg/Tm)、粘度(η)、αβ1/3、临界冷却速度(Rc)、非晶晶化开始温度(Tx)与合金开始熔化温度(Tm)之比(Tx/Tm)、合金开始熔化温度(Tm)与玻璃转变温度(Tg)或非晶晶化开始温度(Tx)之差△Tm(△Tm=Tm-Tg或△Tm=Tm—Tx)、电子浓度e/a、原子尺寸、重力等。
简介:Throughmeasuringthecoefficientoflinearexpansion,thestructureandpropertiesoftheLi2O-Al2O3-SiO2lowexpansionglassceramicscontainingB2O3arestudiedbyJRandXRD.ItisshoutnthattheIRmethodisefficientinthestudyoftheglass-ceramicsstructure.Thereisa"Boronabnormality"inthesystemwhichhasanimportantinfluenceonthepropertiesoftheglass-ceramics.
简介:TheelectronicstructuresofCuS2,CuSe2andCuTe2withpyritestructures,withintheframeworkthedensity-functionaltheoryhavebeeninvestigated.ThecalculatedresultsexplainedtherecentexperimentalresultswhichshowthatthereisnoclearindicationofstrongelectroncorrelationsintheelectronicpropertiesofCupyrites,duetothedominantchalcogenpcharacterratherthandcharacteristicofCuattheFermilevel.
简介:TheantibacterialeffectofcarryingsilverB2O3-SiO2-Na2Oglassmaterialwasstudiedbymeansofantibacterialring,nephelometery,MICvalue,thinfilmattachmentandmicrocalorimetry,respectively.TheexperimentalresultsoffivekindsofantibacterialtestmethodsarealmostidenticalandcanverifythatcarryingsilverB2O3-SiO2-Na2Oglassmaterialexertsanexcellentantibacterialperformance.Antibacterialringandnephelometeryaresimple,quick,buttheprecisionisrestrictive.MICvalue,thinfilmattachmentmethodandmicrocalorimetrycanquantitativelycomparetheantibacterialeffectsoftheantibacterialglassmaterial.Comparedwiththetraditionalmicrobetestmethods,themicrocalorimetrycananalyzetheinhibitingeffectofthecell'sgrowthandmetabolismontheantibacterialglassmaterialbymonitoringthethermaleffectcontinuouslyandautomatically.
简介:Newvisibletransparent,UVabsorption,andhighinfraredreflectionpropertieshavebeenrealizedbydepositingmultilayerSiO2/ZnO:Al/CeO2-TiO2/SiO2filmsontoglasssubstratesatlowtemperaturebyradiofrequencymagnetronsputtering.OptimumthicknessofSiO2,ZnO:Al(ZAO)andCeO2-TiO2(CTO)filmsweredesignedwiththeaidofthinfilmdesignsoftware.Thedegreeofantireflectioncanbecontrolledbyadjustingthethicknessandrefractiveindex.TheouterSiO2filmcandiminishtheinterferencecoloringandincreasethetransparency;theinnerSiO2filmimprovestheadhesionofthecoatingontheglasssubstrateandpreventsCa2+,Na+intheglasssubstratefromenteringtheZAOfilm.Theaveragetransmittanceinthevisiblelightrangeincreasesbynearly18%-20%,ascomparedtodoublelayerZAO/CTOfilms.Andthefilmsdisplayhighinfraredreflectionrateofabove75%inthewavelengthrangeof10-25μmandgoodUVabsorption(〉98%)properties.Thesesystemsareeasytoproduceonalargescaleatlowcostandexhibithighmechanicalandchemicaldurability.ThetriplefunctionalfilmswithhighUVabsorption,antireflectiveandhighinfraredreflectionratewilladapttoapplicationinflatpaneldisplayandarchitecturalcoatingglass,automotiveglass,withdiminishinglightpollutionaswellasdecreasingeyefatigueandincreasingcomfort.
简介:Inpursuingexcellentsupercapacitorelectrodes,wedesignedaseriesofM0S2/C0S2compositesconsistingofflower-likedMoS2andoctahedron-shapedCoS2throughafacileone-stephydrothermalmethodandinvestigatedtheelectrochemicalperformanceofthesampleswithvarioushydrothermaltime.Duetothecouplingoftwometalspeciesandabigamountofwell-developedCoS2andMoS2,theresultsindicatedthattheMoS2/CoS2compositeselectrodesexhibitedthebestelectrochemicalperfor-mancewithalargespecificcapacitanceof490F/gat2mV/sor400F/gat10A/gamongallsamplesasthehydrothermaltimereached48h(MCS48).Furthermore,theretentionofMCS48is93.1%after10000cyclesat10A/g,whichmanifeststheexcellentcyclingstability.TheoutstandingelectrochemicalperformanceofMCS48indicatesthatitcouldbeaverypromisingandnovelenergystoragematerialforsupercapacitorsinthefuture.
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: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:TiB2ceramicspowderwassynthesizedfromB2O3-TiO2-Mgsystem.TheeffectsofTiB2additionasdiluentonthecombustionsynthesisprocesswereinvestigated.TheresultsofthermodynamiccalculationandexperimentsshowthattheincreaseofTiB2contentrangingfrom0to20wt%canreducetheadiabatictemperatureTadfrom3100Kto2896KandcombustiontemperatureTcfrom2139Kto1621Krespectively.TheparticlesizeandhalfwidthoftheparticledistributionarealsoincreasedwiththeadditionofTiB2increasingfrom0to20wt%.ThecombustionproductisamixtureofTiB2,MgO,andotherintermediatephases.TheleachedproductcontainsmainlyTiB2,TiO2andTiN,anditsoxygencontentis7.77wt%.
简介:TiO_2isapromisingphotocatalyst.However,thelowphotocatalyticefficiencycallsforthemodificationofTiO_2.Metal-andnonmetal-dopingofTiO_2havebeenprovedtobeeffectivewaystoenhancephotocatalyticproperties.Thisreviewprovidesadeepinsightintotheunderstandingofthemetal-andnonmetal-dopedTiO_2photocatalysts.ThisarticlebeginswiththeintroductionofthecrystalstructuresofTiO_2andapplicationsofTiO_2materials.Wethenreviewedthedoped-TiO_2systemintwocategories:(1)metal-dopedTiO_2photocatalystssystem,and(2)nonmetal-dopedTiO_2photocatalystssystem.Bothexperimentalresultsandtheoreticalanalysesareelaboratedinthissection.Inthefollowingpart,fortheadvantagesofTiO_2thinfilmsoverparticles,variouspreparationmethodstoobtainTiO_2thinfilmsarebrieflydiscussed.Finally,thisreviewendswithaconciseconclusionandoutlookofnewtrendsinthedevelopmentofTiO_2-basedphotocatalysts.