CETMIC 05378
CENTRO DE TECNOLOGIA DE RECURSOS MINERALES Y CERAMICA
Unidad Ejecutora - UE
artículos
Título:
Characterization of a mechanochemically activated titanium-hematite mixture: Mössbauer spectroscopy study
Autor/es:
A.A. CRISTÓBAL; C.P. RAMOS; P. BOTTA; E.F. AGLIETTI; C. SARAGOVI; J.M. PORTO LOPEZ
Revista:
PHYSICA B - CONDENSED MATTER
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2009 vol. 404 p. 2751 - 2753
ISSN:
0921-4526
Resumen:
a b s t r a c t Mechanochemicalprocessesinvolvingreactionsbetweenmetalsandcrystallineoxidesareofinterest becauseoftheirpotentialtechnologicalapplicationsinstructural,magneticorelectricmaterials.In additiontheycancontributetotheunderstandingofthenaturaloccurringprocessesthatleadtothe formationofmineralsandsoils.Thecontrolledstudiesofhowthedistributionofcationsinthe titanomagnetitestakesplacecanhelptowardbuildingamodelforthenatureoftheirmagnetismand, since theyaretheprimarycarriersofrockandsoilmagnetism,arethereforeintensivelyinvestigatedin manyexperimentalandtheoreticalstudies. In behalfofabettercomprehensionofthethermal,physicalchemical,magneticandhyperfine behavior,wehaveconsideredatitaniumandhematitemixture,withmolarratioTi:Fe2O3 of 1:2, mechanochemicallyactivatedduringdifferentactivationtimes.Wehavestudiedthedevelopmentof new phasesbyX-raydiffraction,scanningelectronmicroscopyandMo¨ ssbauer spectroscopy.The evolution fromthestartingmaterialsaffectedbydifferentmillingtimesandsubsequentannealing shows thatTireducestheFeionsintheFe2O3 lattice,partlytoFe2+ and partlytometallicFe. & 2009ElsevierB.V.Allrightsreserved Mechanochemicalprocessesinvolvingreactionsbetweenmetalsandcrystallineoxidesareofinterest becauseoftheirpotentialtechnologicalapplicationsinstructural,magneticorelectricmaterials.In additiontheycancontributetotheunderstandingofthenaturaloccurringprocessesthatleadtothe formationofmineralsandsoils.Thecontrolledstudiesofhowthedistributionofcationsinthe titanomagnetitestakesplacecanhelptowardbuildingamodelforthenatureoftheirmagnetismand, since theyaretheprimarycarriersofrockandsoilmagnetism,arethereforeintensivelyinvestigatedin manyexperimentalandtheoreticalstudies. In behalfofabettercomprehensionofthethermal,physicalchemical,magneticandhyperfine behavior,wehaveconsideredatitaniumandhematitemixture,withmolarratioTi:Fe2O3 of 1:2, mechanochemicallyactivatedduringdifferentactivationtimes.Wehavestudiedthedevelopmentof new phasesbyX-raydiffraction,scanningelectronmicroscopyandMo¨ ssbauer spectroscopy.The evolution fromthestartingmaterialsaffectedbydifferentmillingtimesandsubsequentannealing shows thatTireducestheFeionsintheFe2O3 lattice,partlytoFe2+ and partlytometallicFe. & 2009ElsevierB.V.Allrightsreserved
