Oxygen diffusion and transport properties in non-stoichiometric Ln2-xNiO4+delta oxides

Materials formulated Ln2-x-y yCaxNiO4+delta (with (i) x=y=0 for Ln=La, Pr, Nd, (ii) x(not equal to)0 when y=0 or y(not equal to)0 when x=0 for Ln=Nd) have been prepared and characterized using various techniques with respect to their mixed ionic/electronic conducting properties. These oxides exhibit...

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Bibliographic Details
Published in:Solid state ionics 2005-11, Vol.176 (37-38), p.2717-2725
Main Authors: Boehm, E, Bassat, J-M, Dordor, P, Mauvy, F, Grenier, J-C, Stevens, Ph
Format: Article
Language:English
Subjects:
Chemical Sciences
Material chemistry
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Summary:Materials formulated Ln2-x-y yCaxNiO4+delta (with (i) x=y=0 for Ln=La, Pr, Nd, (ii) x(not equal to)0 when y=0 or y(not equal to)0 when x=0 for Ln=Nd) have been prepared and characterized using various techniques with respect to their mixed ionic/electronic conducting properties. These oxides exhibit high electronic conductivity ({approximately equal to}100 S cm-1 at T=700 deg C) as well as high values of oxygen diffusion and surface exchange coefficients (D* and k, determined using SIMS analysis of the 18O isotope). The oxygen diffusion performances of Pr2NiO4+delta are the highest ones among those of the studied compounds. Interestingly, in the Nd-series they are slightly improved by the creation of Nd vacancies, while they are affected by the substitution of Nd by Ca.
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2005.06.033