6533b870fe1ef96bd12cfa06

RESEARCH PRODUCT

The solubility of Co in TiO2 anatase and rutile and its effect on the magnetic properties

Wolfgang TremelMartin PanthöferMeike Fleischhammer

subject

Oxide mineralsAnataseMaterials scienceAnnealing (metallurgy)MagnetismDopingInorganic chemistryAnalytical chemistryCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsInorganic ChemistryParamagnetismFerromagnetismRutileMaterials ChemistryCeramics and CompositesPhysical and Theoretical Chemistry

description

Co-doped anatase and rutile bulk-samples prepared by the sol-gel technique are found to be paramagnetic at room-temperature. Only further annealing in Ar/H{sub 2} gas results in a ferromagnetic behavior. X-ray diffraction and electron-microscope studies reveal for low doping levels =4%. The observed Co oxides are reduced by Ar/H{sub 2} to Co metal. The room-temperature ferromagnetism can therefore be traced back to a segregation of metallic Co. - Graphical abstract: Co-doped anatase and rutile bulk-samples prepared by the sol-gel technique are paramagnetic at room-temperature. Further annealing in Ar/H{sub 2} gas results in a ferromagnetic behavior. X-ray diffraction and electron-microscope (SEM, BSE) studies reveal for low doping levels =4%. The observed Co oxides are reduced by Ar/H{sub 2} to Co metal. The room-temperature ferromagnetism can be traced back to a segregation of metallic Co

yearjournalcountryeditionlanguage
2009-04-01Journal of Solid State Chemistry
https://doi.org/10.1016/j.jssc.2009.01.011