超声化学法制备不同形貌的CaF2微米晶.pdf

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1、第28卷第l期无机化学学报V0I-28No．I2012年1月CHINESEJOURNALOFINORGANICCHEMISTRY185—190超声化学法制备不同形貌的CaF2微米晶王淼陈婷婷汤艳峰江国庆石玉军(南通大学化学化工学院，南通226019)摘要：采用超声化学法，以CaC1与不同氟源(NaBF4、K：SiF6)在溶液中反应，制得了不同形貌的CaF：微米晶(立方体、花状、多面体1。用XRD、SEM及TEM对产物晶相及形貌进行了表征。XRD结果显示所有产物均为结晶良好的立方相CaF：。SEM及TEM结果表明由NaBF制得的产物形貌为均匀的立方体微米晶，而由KzSi

2、F制得的产物为多面体。在添加配体Na2EDTA的情况下，由NaBF4得到的产物为纳米片组成的花状结构。本文详细讨论了氟源种类、反应物比例、配体等反应参数对产物CaF2形貌的影响．并提出了可能的反应机理。关键词：CaF2；微结构；超声法；Na~EDTA中图分类号：O614．231：O613．41文献标识码：A文章编号：1001—4861(2012)01—0185—06SonochemicalSynthesisofDiferentMorphologicalCaF2MicrostructuresWANGMiaoCHENTing—TingTANGYan—FengJIANGGu

3、o—QingSHIYu—Jun(SchoolofC船m￡andChemicalEngtneering,NantongUniversity,Nantong,Jiangsu226019，China)Abstract：DifferentmorphologicalCaF2crystals(cubes，flowers，polyhedra)weresynthesizedviaamildsonochemicalroutefromanaqueoussolutionofCaC12andNaBF4orK2SiF6．Thecrystalstructuresandmorphologiesof

4、theproductswerecharacterizedbyusingXRD，SEMandTEM．Theresultsshowthattheas-preparedproductsarecubicstructureandwithhighcrystallinity．UniformmicrocubesandpolyhedracanbeeasilysynthesizedfromNaBF4andK2SiF6，respectively．InthepresenceofcomplexagentNa2EDTA，uniform3Dfower．1ikeCaF，hierarchicalstr

5、uctureswerepreparedandassembledbynumerousnanoflakes．Somereactionparameters(fluoridesource，molarratioandchelatingreagent)wereinvestigatedduringtheprocessofobtainingdifferentmorphologicalCaF2．Furthermore，apossiblereactionmechanismf0rthegrowthofCaF：isproposed．Keywords：CaF2；microstructure；s

6、onoehemiealroute，Na2EDTA0Introductionthebubblesit]．Theremarkableenvironmentsprovideauniqueplatformforthegrowthofnanomaterials．UptoUltrasoundisafast，eficientanduniqueheatingnOW，avarietyofinorganicmaterials，includingmetalmethod，therefore，sonochemicalroutehasbeenoxides，sulfides，hydrateshav

7、ebeenpreparedviadevelopedintoapowerfulmethodforsynthesisofsonochemicalmethod【．However．1ittleworkhasbeenmicro／nanomaterials．Whenliquidsareirradiatedbyc0nductedforthefabricationofinorganicfluoridesI91．high—intensityultrasound．hightemperatures．pressuresAsanimportantfluoride，nanosc