Author/Authors :
Yu.V. Frolova-Borchert، نويسنده , , Yu. V. and Sadykov، نويسنده , , V.A. and Alikina، نويسنده , , G.M. and Lukashevich، نويسنده , , A.I. and Moroz، نويسنده , , E.M. and Kochubey، نويسنده , , D.I. and Kriventsov، نويسنده , , V.V. and Zaikovskii، نويسنده , , V.I. and Zyryanov، نويسنده , , V.V. and Uvarov، نويسنده , , N.F.، نويسنده ,
Abstract :
Nanocomposites comprised of fluorite-like (Gd- or Pr-doped ceria) and perovskite-like (LaMnO3+δ) phases were prepared using a polymerized precursor (Pechini) route. Genesis of the structure of composites with annealing temperature has been studied by X-ray diffraction, Transmission Electron Microscopy and EXAFS. Up to 1300 °C, particle sizes of both fluorite and perovskite phases remain in the nano-range. Interaction between components is reflected in the increase of doped ceria lattice parameter and disordering of Mn coordination sphere. Despite this interaction, nanocomposites possess a high conductivity along with a high lattice oxygen mobility and reactivity. The addition of CoO improves sintering of nanocomposites.
Keywords :
Doped ceria , Lanthanum manganite , Synthesis , Conductivity , structure , nanocomposites
