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1、SYNTHESIS,CHARACTERIZATION,ANDREACTIVITYOFFEITKNECHTITEJ.Luo*,S.R.Segal*,J.Y.Wang*,Z.R.Tian*,S.L.Suib*,**U-60,DepartmentofChemistry,UniversityofConnecticutStorrs,CT06269-4060,suib@uconnvm.uconn.edu**DepartmentofChemicalEngineeringandInstituteofMaterialsScienceABSTRACTThesynthesi
2、sofMg2+dopedP-MnOOHwhichisknownasfeitknechtiteisreported.FeitknechtiteisalayeredmaterialhavingtheCd12structure.ThecharacterizationofMg2+dopedfeitknechtitewasdonewithX-raypowderdiffraction,elementalanalysis,energydispersiveX-rayanalysis,scanningelectronmicroscopy,alternatingcurre
3、nt(AC)impedance,Fouriertransforminfraredspectroscopy,thermogravimetricanalysis,differentialscanningcalorimetry,averageoxidationstatetitrationsofmanganese,andaciditymeasurements.TheformationoffeitknechtiteisrelatedtotheMnO4-/Mn2+ratiousedinthesynthesis.Feitknechtitecanbeconverted
4、tosyntheticbirnessiteoroctahedrallayerbirnessite(OL-1)whichisaprecursortothe6.9Atunnelstructurematerialtodorokite.INTRODUCTIONThemineralfeitknechtite[3-MnOOH]wasfirststudiedsystematicallybyFeitknechtandMartiin1945[1].TheypreparedamixedphaseofMnOOHandMn304byoxidationofanaqueoussu
5、spensionofMn(OH)2.TheyassignedthismixedphasematerialonthebasisofX-raypowderdiffractionmethodsandreferredtoitashydrohausmannite.Frondelin1952reported[2]thatamineralfromFranklin,NewJerseyhadasimilarX-raypowderdiffractionpatternasthatofhydrohausmannite.In1962,Feitknecht,Brunner,and
6、Oswald[3]suggestedonthebasisofelectronmicroscopydatathatthematerialreferredtoashydrohausmannitebyFeitknechtandMarti[1]wasamixtureofMn304and03-MnOOH,whichwasthereafterreferredtoasfeitknechtite.Thestructureof03-MnOOHisnowrecognizedashavingtheCdl2structure[4].TherearetwootherMnOOHp
7、hases.AllthreephasesconsistofMnO3(OH)3octahedrathatshareedgesandverticesindifferentways.OneoftheothertwophasesiscL-MnOOHwhichisknownasgroutiteandhasadoublechainstructure[4].Theotherphasey-MnOOHisknownasmanganiteandhasacorrugatedstructure[4].Differentoxidationconditionscanyieldsy
8、ntheticversionsofmanganite[5,.6].Stabilityrelat
