简介：ＳｐｅｃｔｒａｌＰａｒａｍｅｔｅｒＳｔｕｄｙｏｎＴｍ３＋ｉｎＮａ５Ｔｍ（ＷＯ４）４ＣｒｙｓｔａｌＹａｏＬｉａｎｚｅｎｇ（姚连增）（ＤｅｐａｒｔｍｅｎｔｏｆＭａｔｅｒｉａｌｓＳｃｉｅｎｃｅａｎｄＥｎｇｉｎｅｒｉｎｇ，ＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅｎｃ...

简介：(Ba0.66Sr0.33)Mg0.8Al11.47O19:Tm0.013+(BSMA:Tm3+)phosphorwassynthesizedbysolid-statereactions.ThesamplewascharacterizedbyX-raydiffraction(XRD),scanningelectronicmicroscope(SEM),vacuumultraviolet(VUV)spectra,ultraviolet(UV)spectraandFT-IRspectrum.XRDpatternrevealsthatBSMA:Tm3+hasthesamestructureasBaAl12O19phase.SEMimageillustratesthatthephosphorhasthehexagonalshapeanddeepslicestructure.VUVandUVemissionspectraat20,50and100Kshowthatthelowtemperatureluminescenceintensitiesbecomeweakgraduallywiththeincreasingofthetemperatureunder147and254nmexcitation.Thestrongbroadbandpeaksataround357and397nmandthepeakat516nmunder147nmexcitationallcorrespondtothecharacteristictransitionsofTm3+ions.However,underUV(254nm)excitation,themainpeakbecomes530nmwhichhasveryhighlineintensity,andthepeaksatabout362and403nmareveryweak.Theexcitationspectrumat20Kshowsthattherearethreeabsorptionpeaksataround153,186and193nmwhen516nmemissionismonitored.Theabsorptionpeaksof[AlO4],[AlO6]andAl-OcanbeobservedinFT-IRspectrum.

简介：Differentfluxeswereusedtosynthesizelongpersistencephosphors,calciumsulfidesactivatedbyEu2+andTm3+,byconvenientsolid-statemethod.ThephosphorusingNH4Fasafluxhasgoodcrystallinityandlargeparticlesize,itsstabilityagainstwaterandotheratmosphericcomponentsisenhanced,anditsafterglowislongerandfluorescentintensityismoreintensethanthoseofthephosphorusingNH4Clasflux.TheirPLintensitiesvariedwithtimeinmoistairweremeasured,noremarkablechangewasfoundforthosepreparedwithNH4FfluxincontrastwithNH4Clasflux.SousingNH4Fasfluxisagoodmethodtoenhancethestabilityofalkalineearthsulfides.

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简介：Thesolutionreactionmechanisms,composition,donoratoms,propertiesofcoordinatelinkandstabilityofthecomplexesonthesystemsofadrenalinewithNa3+,Gd3+andTm3+havebeenstudiedbypH-potentiometrictitrationandelectronicspectroscopy.Adrenalineperturbsthef-felectronictransitionofNd3+andTm3+sothattheabsorptionspectraoftheircomplexesareshiftedtowardlongerwavelengths.Theabsorptionspectraofthecomplexesformedbythethreef-blockelementionswithadrenalineareshiftedtowardshorterwavelengthswiththeincreaseofPHinΔγ=350～650nm

简介：Glasseswiththecompositionof65GeO212Ga2O3-10BaO-8Li2O-5La2O3(molarratio)dopedwith1.526wt.%,3.006wt.%,5.836wt.%,11.028wt.%,and15.678wt.%Tm2O3,respectively,werefabricatedbyconventionalmeltingmethod.AccordingtotheabsorptionspectraandtheJudd-Ofelttheory,theJ-Ostrengthparameters(Ω2,Ω4,Ω6)werecalculated,withwhichtheradiativetransitionprobabilities,branchingratiosandradiativelifetimeswereobtained.Theinfraredemissionspectra(with808nmLDexcitation)at～1.47and～1.8μmofvariousconcentrationsofTm3+-dopedglasseswerestudied.Theemissionintensityat～1.8μmreachedtothemaximumwhentheTm2O3-dopingconcentrationwasneartobe～3.006wt.%(1.0mol.%),andthendecreasedasdopingconcentrationincreasedfurther.Themechanismofthefluorescenceintensitychangewasexplainedwiththecross-relaxationeffectandtheconcentrationquenchingeffectofTm3+.Meanwhile,accordingtoMcCumbertheory,theabsorptionandemissioncross-sectionscorrespondingtothe3F4→3H6transitionsofTm3+at1.8μmwasobtained.ForTm3+-dopedgermanateglasses,themaximumemissioncross-sectionreachedavaluehigherthanthatre-portedforfluorozircoaluminateglasses.Itisexpectedtobeafavorablecandidatehostfor～2.0μmmid-inflatedlaserbecausetheglassshowsfavorableopticalspectra.

简介：LanthanidedopedNaYF4microcrystalsweresynthesizedviaafacilehydrothermalmethod.MulticolorupconversionluminescencewasobservedinNaYF4microcrystalsdopedwithYb3+/Er3+,Yb3+/Tm3+,andYb3+/Er3+/Tm3+undertheexcitationof980nminfraredlight.Importantly,theexcitationpowerdensitydependenceofupconversionemissionintensityindicatedclearlytheenergytransferfromTm3+toEr3+ionsundertheexcitationoflowpowerdensity(5×102–9×102W/cm2).Meanwhile,theinverseenergytransferfromEr3+toTm3+ionsundertheexcitationofrelativelyhigherpowerdensity(4.1×104–4.9×104W/cm2)wasalsorevealed.ThiswasadirectevidenceforreversibleenergytransferbetweenEr3+andTm3+ions.Undertheexcitationofhighpowerdensity(4.1×104–4.9×104W/cm2),darksensitizerswerealsomotivatedsothatthebottleneckeffectofhighconcentrationYb3+iondopingwasbroken.ThiswasthemainreasonforrealizinghighupconversionefficiencyofthesampleswithheavydopingofYb3+ion.

简介：Er3+-Tm3+-Yb3+tri-dopedBaMoO4phosphorsweresynthesizedbyco-precipitationtechniqueandcharacterizedbyX-raydiffractionanalysis,absorptionstudyandfieldemissionscanningelectronmicroscopyanalysis.Upconversionaswellasdownconversionluminescencestudieswereperformedbyusingnearinfrared（980nm）andultraviolet（380nm）excitations.Energyleveldiagram,pumppowerdependenceandcolourcoordinatestudywereutilizedtodescribethemulticolorupconversionemissionproperties.Undersingle980nmdiodelaserexcitationthedualmodesensingbehaviourisrealizedviaStarksublevelsandthermallycoupledenergylevelsoftheTm3+andEr3+ionsinthepreparedtri-dopedphosphors.AcomparativefluorescenceintensityratioanalysisforintegratedemissionintensitiesarisingfromtheStarksublevels{1G4（a）and1G4（b）}andthermallycoupledenergylevels{2H11/2and4S3/2}oftheTm3+andEr3+ions,respectivelywascarriedoutinthepreparedtri-dopedBaMoO4phosphors.ThemaximumsensitivityforthermallycoupledenergylevelsoftheEr3+andStarksublevelsoftheTm3+ionwasreported.Thedevelopedphosphorscouldbeusefulinthedisplaydevicesandopticalthermometricapplications.

简介：介绍侯了某炼厂奥斯麦特炼铜工艺节能实践，通过强化节能管理、加强经济责任制考核，采取富氧吹炼工艺节能技术、完善余热蒸汽系统、应用节能产品、合理分级用水提高水重复利用率等措施,降低能耗，提高经济效益。

简介：AdetailedstudyofthefluorescenceemissionpropertiesandenergytransfermechanisminEr3+/Tm3+co-dopedleadsilicateglasseswasreported.Enhancednearinfrared1.8μmandvisibleup-conversionemissionswereinvestigatedunder808and980nmexcitations,respectively.TheenergytransfermechanismbetweenEr3+andTm3+wasanalyzedaccordingtotheabsorptionspectra,theemissionspectraandthelevelstructuresofEr3+andTm3+.TheenergytransferefficiencybetweenEr3+andTm3+reached68.1%intheEr3+/Tm3+co-dopedleadsilicateglasseswhenpumpedby808nmlaserdiode.Basedontheabsorptionspectra,theJudd-Ofeltparameters,spontaneousemissionprobability,absorptionandemissioncrosssections,gaincoefficientswerecalculatedandanalyzed.Itwasfoundthatthecalculatedemissioncrosssectionandthemaximumgaincoefficientaround1.8μmwere4.9×10–21cm2and1.12cm–1,respectively.TheseresultsindicatedthattheEr3+/Tm3+co-dopedlead-silicateglasseshadpotentialapplicationinnearinfraredlasers.

简介：包头稀土研究院课题组对包头白云鄂博资源中铌、钪综合提取技术研究取得突破性进展，在实验室完成了对白云鄂博选铌尾矿中钪的提取及铌精矿还原熔分富铌渣中铌、钛、钪和稀土的综合提取技术，选铌尾矿中钪的提取率大于90％，富铌渣中铌、钛、钪和稀土的综合提取率大于85％以上，为后续分离提纯制备高纯度氧化钪、氧化铌产品奠定了基础。

简介：本文概述了kivcet炼铅专利技术发展完善成KSS炼铅技术的主要历程，重点介绍了KSS炼铅技术的冶炼工艺和设备，以及发展完善过程中的主要改进工作和生产实绩，同时还介绍了1993年计划停产大修基本情况及开炉主要内容，并就我国炼铅工业的发展提出了见解。

简介：一系列立方的稀土元素sesquioxidesRE2O3的拉曼系列(RE=Eu，Gd，Dy，惊讶，嗯，Tm，Yb，陆，Sc和Y)被拉曼光谱学与532和785根nm激光线调查。丰富的另外的乐队由于激光激动的光被观察。为Eu2O3，Dy2O3，Ho2O3，Er2O3，Tm2O3和Yb2O3，，光主要为Gd2O3，Lu2O3，Sc2O3和Y2O3来自内在的三价的lanthanide离子，他们的光被归因于象Eu3+，Nd3+和Er3+那样的另外的光lanthanide离子的踪迹杂质。这调查为检测踪迹作为一个有用工具证实了拉曼光谱学光lanthanide杂质。

简介：据俄罗斯《新闻报》报道，俄诺里尔斯克镍业公司成功收购了加拿大莱昂矿业国际公司（LionOre）。莱昂矿业公司透露，该公司已经解除了与另一竞购者瑞士斯特拉塔公司（Xstrata）公司的交易协议，斯特拉塔公司开出的收购价为56亿美元。莱昂矿业国际公司做出这一决策是因为诺里尔斯克镍业公司开出了更高的收购价格。本次交易可能会成为俄罗斯公司在海外金额最高的收购交易。

简介：据报道，日本和马达加斯加政府正就拉乔纳里马曼皮亚尼纳总统下月中旬访问日本展开协调，这将是其时隔7年再次访日。日本希望通过资源外交加强两国关系，并就旨在日本人常的联合国安理会改革谋求合作。

简介：据外电1月13日消息，加拿大矿产商Sherritt（SherrittInternational）和日本住友商事（SumitomoCorp）合资拥有的马达加斯加Ambatovy镍矿将亏逾17亿美元，而该矿巨亏的背后原因就是已经跌至12年低位的国际镍价。镍价下滑已经令很多镍矿产商苦不堪言。

简介：本文重点介绍了诺里尔斯克镍业集团塔尔纳赫选矿厂和诺里尔斯克选矿厂两个选矿厂的发展历程、生产经营与规模化扩能改造情况，简述了诺里尔斯克镍业硫化铜镍矿原料来源与构成，以及近年来在选矿流程优化、设备改进、新药剂推广应用等方面取得的成果。

简介：随着能源危机意识的不断加强，提高低碳生产，已成为全球的主题，城市生活的低碳化成为世界各国关注的焦点。稀土在未来低碳经济中所扮演的角色越来越被人们重视，为了更加深入的了解稀土产业与低碳经济的关联；积极探索稀土清洁生产，提高资源利用率；

简介：据马国《快报》报道，尽管马达加斯加镍钴矿项目2011年才能正式投产，但其镍钴产品已吸引了外国多家买主前来洽购。其中，韩国现代汽车集团近日已宣称将成为该项目镍钴产品的第一买主。

简介：据莫斯科12月29日消息，全球最大的镍和钯金矿商和出口商——俄罗斯诺里尔斯克镍业（NorilskNickel）周二表示，已同意以1亿美元将西伯利亚东部一个矿业项目13．3％的股权出售给中国投资者财团。以Bystrinskoye金铜矿项目股权出售给最高landFund财团的价格来看，对该项目的估值为6．5亿美元。