Details

Autor(en) / Beteiligte

• Sadykov, V. A.
• Kharlamova, T. S.
• Mezentseva, N. V.
• Pavlova, S. N.
• Sadovskaya, E. M.
• Muzykantov, V. S.
• Bespalko, Yu. N.
• Usol’tsev, V. V.
• Zevak, E. G.
• Kriger, T. A.
• Ishchenko, A. V.
• Uvarov, N. F.
• Ulikhin, A. S.
• Chaikina, M. V.
• Argirusis, C.

Titel

Studies of oxygen transport mechanism in electrolytes based on doped lanthanum silicate with apatite structure using techniques of oxygen isotopic heteroexchange and impedance spectroscopy

Ist Teil von

• Russian journal of electrochemistry, 2011-04, Vol.47 (4), p.427-441

Ort / Verlag

Dordrecht: SP MAIK Nauka/Interperiodica

Erscheinungsjahr

2011

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The work presents the results of studying the mechanism of oxygen transport for a new promising class of oxygen-containing electrolytes based on lanthanum silicate with an apatite structure using impedance spectroscopy and isotopic oxygen heteroexchange. At 1000 K, in the case of samples with an optimum composition including codoped Fe and Al, σ ∼ 3 × 10 −3 to 10 −2 S/cm and D * reaches ∼10 −8 cm 2 /s, which is close to the values of YSZ and Ce 0.9 Gd 0.1 O 2 − δ (GDC). Lower energies of conductivity activation and oxygen diffusion for doped apatites (∼0.5–0.8 eV instead of ∼1 eV for GDC) and also equivalence as regards exchange of all oxygen atoms within apatite agree with the model, in which oxygen mobility is determined by a nonlinear cooperative migration process of oxygen atoms with fast exchange between interstitial and regular sites.