Abstract
The thermal decomposition of pure ammonium metavanadate (AMV) and of AMV doped with Fe3+,Co2+ or Ni2+ ions was investigated by TG, DTA, IR and X-ray diffraction. The results obtained revealed that the presence of these dopants enhances the formation of the intermediate compounds V2O5 solid. Some of the V5+ ions of the V2O5 lattice seemed to be reduced to V4+ ions. The activation energies of the different decomposition stages for all samples were calculated. The doped solids calcined at 450°C were characterized by the determination ofSbet and by electrical conductivity measurements. The mechanisms by which these ions affect the properties of the solids produced are discussed in relation to the defect structure created by the doping process.
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