简介:Titaniumnitride(TIN)filmsweredepositedonAISI304stainlesssteelsubstratesusinghollowcathodeplasmaphysicalvapordeposition(HC-PVD).TitaniumwasintroducedbyerodingtheTicathodenozzleandTiNwasformedinthepresenceofanitrogenplasmaexcitedbyradiofrequency(RF).Thesubstratebiasvoltagewasvariedfrom0to-300Vandtheuniformityinfilmthickness,surfaceroughness,crystalsize,microhardnessandwearresistanceforthefilmwithadiameterof20mmwasevaluated.Althoughthecentralzoneoftheplasmahadthehighestiondensity,thefilmthicknessdidnotvaryappreciablyacrossthesample.Theresultsfromatomicforcemicroscopy(AFM)revealedalowsurfaceroughnessdominatedbyanisland-likemorphologywithasimilarcrystalsizeontheentiresurface.Highermicrohardnesswasmeasuredatthecentralzoneofthesample.Thesampletreatedat-200Vhadexcellenttribologicalpropertiesanduniformity.
简介:Nuclearbindingenergies,chargeradiiandthechargedistributionsofeven-eventin(Sn)isotopesarecalculatedusingrelativisticmeanfieldtheory,andthetheoreticalresultsarefoundtobeinaccordancewiththeexperimentaldata.ThenuclearchargeformfactorsforSnisotopesarecalculatedusingthephase-shiftanalysismethod.ItisshownthattheminimaofthechargeformfactorsshiftupwardandinwardwithanincreaseintheneutronnumberoftheSnisotopes.
简介:Indiumtinoxide(ITO)transparentconductingfilmwastreatedwithoxygenplasmaimmersionionimplantation(PIII).X-rayphotoelectronspectroscopy(XPS)wasemployedtocharacterizetheeffect.Theresultssuggestedthattheoxygencontentinthesurfacewasincreasedandmaintainedformorethan50hcomparedwithtraditionalplasma-treatedsamples.Meanwhile,theworkfunctionofITOestimatedbycomparingthepeakshiftintheXPSdiagramsuggestedacorrespondingincreasebymorethan1eV.
简介:LiNdP4O12(LNP)晶体是一种新型的激光材料。本文报道了用同步辐射X射线白光形貌术和光学显微法研究由助熔剂籽晶旋转法生长的LNP晶体的生长缺陷,观察到了圆形生长台阶及精细的系列台阶结构,对晶体中的包裹物和位错缺陷等进行了详细的观察描述,还发现了一种比较奇特的腐蚀沟槽,分析了这种腐蚀沟槽的形成机理及各种缺陷的成因和克服办法。
简介:报道了用同步辐射X射线白光形貌术和光学显微法研究由助熔剂籽晶旋转法生长的LNP晶体的生长缺陷。本文除对晶体中的包裹物和位错缺陷等进行了详细观察描述外,还发现了一种比较奇特的腐蚀沟槽。最后分析了这些缺陷的成因和克服办法。
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简介:采用XAFS方法研究浸渍法制备并于低温焙烧的CuO/γ-A12O3催化剂的局域结构。对于CuO负载量小于单层分散阈值的CuO/γ-A12O3(0.4mmol/100m2),结果表明CuO物种是以层状分散的孤立原子簇存在于γ-Al2O3载体表面,其第一近邻Cu-O配位环境的结构与晶态CuO的相似,键长和配位数分别为0.195nm和4。对于CuO负载量等于单层分散阈值的CuO/γ-A12O3(0.8mmol/100m。),已有少量的CuO纳米颗粒生成。对于CuO负载量大于单层分散阀值的CuO/γ-A12O3(1.2mmol/100m2),其结构与多晶CuO的相近。基于CuO在γ-A12O33载体上的三种不同分散状态的结构特点,我们提出了CuO/γ-A12O3催化剂的结构模型。
简介:Theγ-Fe2O3nanoparticlescoatedwithDBSandCTABwerepreparedbythemicroemulsionmethod.Thecoatedsamplesshowenhancednonlinearopticalpropertiescomparedwiththeirbulkcouterpart.The.Moessbauerspectraatroomtemperatureweremeasuredforthecoatedferricoxides.Themonolayersoftheorganicmoleculearefoundtohaveastrongchemicalbondwiththesurfaceatomsandthushaveasignificantinfluenceontheelectronstructureofparticlesurface.@1999ActaMetallurgicaInc.
简介:ThetransientopticalpropertiesofnovelPbSnanoparticlescoatedwith2.6-O-diallyl-β-cyclodextrines(CDs)werestudiedbythefemtosecondpump-probetechnique.Theresultsshowthattheultrafasttransient-inducedabsorptionforthenovelcase.ComparedtothePbSnanoparticlesstabilizedwithpolyvinylalcohol(PVA),wefindthattheprocessforthenovelcaseisdifferentfromthePbS(PVA),WesuggestthattheCDssurfacemodificationcantrapholesonthesurfaceofPbSnanoparticles.ThiscaninduceanefficientchargeseparationbetweenthePbSnanoparticlesanditssurfaceandresultinanultrsafast-inducedabsorptionfornovelPbSnanoparticles.
简介:Thenanoparticlesγ-Fe2O3coatedwithsurfactants.DBS,STandCTAB.repsectively.weresynthesizedbymicroemulsionmethod.Thecoatedferricoxides.whichshowenhancednonlinearopticalpropertiescomparedwiththeirbulkcounterpart.wereprobedbyEXAFSinsolutionforms.Thex=-rayabsorptionspectraforFeKedgeweremeasuredatroomtemperaturebyhelpofsynchrotronradiationlightsource.Extendedx-rayabsorptionfinestructureanalysisshowsthatthecoatinglayersoforganicmoleculesinteractwithsurfaceatomsofnanopartices,theFe-Obondlengthwasextended.