MAUVY, Fabrice; BASSAT, Jean-Marc.; BOEHM, Emmanuelle; DORDOR, Patrice; LOUP, J. P.

doi:10.1016/S0167-2738(02)00903-7

Metadatos

Mostrar el registro completo del ítem

Licencia de uso del documento

MAUVY, Fabrice
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

BASSAT, Jean-Marc.
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

BOEHM, Emmanuelle
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

Idioma

Article de revue

Este ítem está publicado en

Solid State Ionics. 2003, vol. 158, n° 3-4, p. 395-407

Elsevier

Resumen en inglés

In mixed electronic and ionic conductors O2−/e− (MIEC), where the electronic conductivity is dominant, the determination of the oxygen diffusion coefficient is an essential feature. In the present paper, the oxygen chemical diffusion coefficient O of a MIEC oxide has been evaluated using the conductivity relaxation method, in the temperature range 773–1173 K. Samples of La2Cu0.5Ni0.5O4+δ were selected because of the high value of their surface exchange coefficient. In addition, the oxygen diffusion coefficient D* was determined from the 18O tracer diffusion profile. Finally, the oxygen partial pressure dependence of this compound was determined by thermogravimetric analysis (TGA). On the basis of these three independent experiments, the model of ambipolar diffusion, which describes the diffusion in mixed oxide, has been experimentally verified. For such a determination of the intrinsic diffusion characteristics, dense samples are required.< Leer menos

Palabras clave en inglés

Conductivity relaxation

Chemical diffusion coefficient

Tracer diffusion

Wagner model

Mixed conductors

La2Cu0.5Ni0.5O4+δ

Metadatos

Licencia de uso del documento

Measurement of chemical and tracer diffusion coefficients of oxygen in La2Cu0.5Ni0.5O4+δ

Idioma

Este ítem está publicado en

Resumen en inglés

Palabras clave en inglés

DOI

Orígen

Centros de investigación