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1.
Crystalengineeringofcoordinationpoly merswithopenframeworksassembledfromor ganic metalcompoundshasbeenofgreatinter estsowingtotheirpotentialpropertiesasnovelmaterialssuchasgasadsorption[1,2 ] ,ion ex change[3] andcatalysis[4] .Theconstructionofcoordinationpolym…  相似文献   

2.
Inthepastfewyears ,themagneticprop ertiesofcomplexescomprisinglanthanideandtransitionmetalionshaveattractedincreasinginterest[1~ 6 ] .Thesecomplexesareimportantinthestudiesofmagneticexchangeinteractionbetweenlanthanideandd transitionmetalions,andtheycanpro…  相似文献   

3.
Recently ,manymaterialresearchershavecometorealizethattheelectroniccharacterhasadecisionalroleonmaterialpropertiesandmicrostructure[1~ 3] .Theseworksrevealanewmechanismtomaterialbehaviorandanewun derstandingelectrontheoryofalloy .Addition aly,theeffectofane…  相似文献   

4.
Themagneticpropertiesofheteropolynu clearcomplexescontainingboth 4fand 3dionshaveattractedconsiderableinterestssince1 985 [1] .Carboxylicacidisakindofpotentialligandforthedesignandsynthesisofthiskindofmagneticmolecularmaterials .Somecar boxylatecompoundswerep…  相似文献   

5.
TheXi′anInternationalHydrometallurgyConference (ICHM′2 0 0 3)willbeheldinXi’an ,China ,October ,2 0 0 3.Theconferencewillprovideaforumforexchangeanddiscussionofnewideasandachievementsrelatedtoallaspectsofhydrometallurgytechnologyinrecentyears .TheXi′anUniversityo…  相似文献   

6.
Owingtothevariationofcoordinatedmodesforcarboxylateanions ,manydifferenttypesofcrystalstructuresfortherareearthcomplexeswitharomaticacidandnitrogen containingligandswereobtained[1~ 4 ] .Theirthermaldecompositionbehaviorhadbeenre portedinpreviouspapers[5~ 8] .…  相似文献   

7.
Thecomplexesofrareearthwithaminoacidsareofmanyspecialfunctions[1 ] ,andtheyhaveveryextensiveapplicationsinbiolo gy ,agricultureandpharmacologicalsci ence[2 ,3 ] .Inrecentyears ,thecomplexesofrareearthwithaminoacidsbecomethehotspotsofrareearthbiologicalinorgani…  相似文献   

8.
Adsorption of Er( Ⅲ ) and Its Mechanism on Diglycolamidic Acid Resin   总被引:15,自引:0,他引:15  
Thesynthesischaracterizationandadsorp tionpropertyofpolymericmaterialshavebeenpublishedinrecentyears[1~ 9] .DiglycolamidicacidresinDAARisanovelpolymericmaterialwhichcontainsafunctionalgroup [-N(CH2 COOH ) 2 ].Itpossessesnotonlyprotonthatcanexchangewithcation ,b…  相似文献   

9.
ecausesomerareearthmetalcompoundshavethepromotiveactiontothegrowthofani malsandplants[1 ] ,andthefunctionofantiin flammation ,antibacterium ,anticoagulantionandanticaner[2 ] ,theinvestigationonthesyn thesesandstructuresoftheeverykindsofrareearthmetalcompounds…  相似文献   

10.
Low Temperature Behaviors of La-Ca-(Mn,Fe)-O CMR Materials   总被引:1,自引:1,他引:0  
Recentlyrareearthoxideswithperovskitestructurehasattractedgreatattentionsowingtotheircolosalmagnetoresistance (CMR)effect,whichareofpotentialapplicationsinmagneticstorage ,sensingandrefrigerating[1,2 ] .TheCMReffectinrareearth manganeseoxidesisexplainedmain…  相似文献   

11.
Rareearthionspossessobviousfosteref fectonthegrowingofcrop[1] .Aminoacidsarethecomponentsofproteins ,andtherearemanyreportsaboutthestudyonthebinarycomplexesofrareearthwithaminoacids[2 ,3] .Imidazoleisaheteroclycliccompoundpossess ingbactericideandanti infecti…  相似文献   

12.
Coordinationcomplexescontainingcy clometallatedligandshaverecentlybeenthefocusofinterestduetotheirunusualphoto physicalandelectrochemicalproperties[1 ] .Someofthecommonestrecentexamplesarebasedonoligopyridineanalogues[2 ] .Thereareanumberofreasonsforthewide…  相似文献   

13.
Recently ,therehasbeenconsiderablein terestinlanthanide(Ⅲ )hexacyanoferratesandtheanalogouscobalt(Ⅲ )aswellaschromium(Ⅲ )complexesbecauseoftheirpotentialascatalytic ,semiconductive ,andmagneticmate rials[1~ 4] .Forexample ,magneticstudiesonaseriesofthree dimensio…  相似文献   

14.
Theresistanceofalloytohightemperatureoxidationdependsontheformationofaslowlygrowingandwelladherentoxidefilm .Thead ditionofsmallamountofrareearthelementscangreatlyimprovetheresistantoxidationpropertyofalloys[1~ 3 ] .Inthispaper ,theoxi dationkineticswasstud…  相似文献   

15.
Spectra and Upconversion of Neodymium Tungstate Crystals   总被引:2,自引:0,他引:2  
Thestudyofneodymiumtungstatecrystalscanbetracedbackto 1 960s[1] .Asonetypeoflasermaterial,howeverithasnotbeenpaidenoughattentionforalongtime .Oneofrea sonsforthisisthatthehighconcentrationofNd3 ionsmakes 1 0 6μmemissionquench .Recently ,theupconversionemissionofh…  相似文献   

16.
Thermal Decomposition Reaction Kinetics Model of Powdered Bastnaesite   总被引:2,自引:1,他引:1  
Thethermaldecompositionofbastnaesitecalcinedinairatmospherewasoneofthepre treatmentstepinhydrometallurgyandpyromet allurgy[1,2 ] .Theinfluenceofdecompositiontemperatureandatmosphereonthedecomposi tionproductswasinvestigatedbyXiangetal[3~ 5 ] .Thermalanalysist…  相似文献   

17.
Thechemicalheatingasakindofheatingmethodforladlerefiningispaidmoreandmoreat tention ,suchasinRH KTB ,CAS OB ( PI) ,RH OB[1- 4] etc .Amongthem ,theCAS OBprocessde velopedrapidlyduetoitsabilityofrapidlyraisingtemperatureandaccuratelyadjustingsteelcomposi tion .Butthe…  相似文献   

18.
Becauseoftheirpossiblerelevancetomodelcompoundsofcationtransportacrossmembranes,differenttypesofopenchain“crown”ethermoleculeshavebeensynthesizedinordertostudytheirinteractionwithsodium ,potassiumandrareearthions[1,2 ] .Panetal.[3 ] showedthatCe3 formsa 1∶1com…  相似文献   

19.
Asabranchofsuperamolecularchem istry ,lanthanidecalixarenechemistryhasat tractedconsiderableresearchinterestforsever alyears[1~ 5 ] .Inthisrespect,Harrowfieldetal.[6~ 13] synthesizedalotoflanthanidecal ixarenecomplexes ,andrevealedtheircrystalstructures .Amongstt…  相似文献   

20.
ICREisaseriesinternationalrareearthconferenceorganizedbytheChineseSocietyofRareEarths(CSRE).The4thInternationalConferenceonRareEarthDevelopmentandApplications(ICRE2001)willbeheldinBeijing,China,onJune1520,2001.TheChineseSocietyofRareEarthshasthepleasuretohostIC…  相似文献   

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