Issue 11, 2003
From the journal:

Physical Chemistry Chemical Physics

Cationtracer diffusion of 138La, 84Sr and 25Mg in polycrystalline La0.9Sr0.1Ga0.9Mg0.1O2.9†

Olaf Schulz,a   Manfred Martin,*a   Christos Argirusisb  and  Günter Borchardtb  

* Corresponding authors

a Institute of Physical Chemistry, Aachen University of Technology, Templergraben 59, 52056 Aachen, Germany
E-mail: martin@rwth-aachen.de
Fax: +49 241 80 92128
Tel: +49 241 80 94712

b Institute of Metallurgy, Technical University of Clausthal, Robert-Koch-Str. 42, 38678 Clausthal-Zellerfeld, Germany
E-mail: christos.argirusis@tu-clausthal.de
Fax: +49 5323 723184
Tel: +49 5323 723189

Abstract

Cation tracer diffusion of 138La, 84Sr and 25Mg in polycrystalline samples of doped lanthanum gallate, La0.9Sr0.1Ga0.9Mg0.1O2.9, was investigated by SIMS for temperatures between 900 °C and 1400 °C. It was found that diffusion takes place through the bulk and along the grain boundaries. The bulk diffusion coefficients are similar for all cations with activation energies which are strongly dependent on temperature. At high temperatures, the activation energies are about 4.5 eV, while at low temperatures values of about 1.5 eV are found. These results are explained by a frozen in defect structure at low temperatures. This means that the observed activation energy at low temperatures represents only the migration energy of the different cations while the observed activation energy at high temperatures is the sum of the defect formation energy and the migration energy. The migration energies of all cations are nearly identical, although 138La and 84Sr are occupying A-sites while 25Mg is occupying B-sites in the perovskite-structure. To explain these experimental findings we propose a defect cluster containing cation vacancies of both the A- and the B-sublattice and anion vacancies as well.

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Article information

DOI
https://doi.org/10.1039/B301882M
Article type
Paper
Submitted
17 Feb 2003
Accepted
17 Apr 2003
First published
06 May 2003

Phys. Chem. Chem. Phys., 2003,5, 2308-2313

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Cation tracer diffusion of 138La, 84Sr and 25Mg in polycrystalline La0.9Sr0.1Ga0.9Mg0.1O2.9

O. Schulz, M. Martin, C. Argirusis and G. Borchardt, Phys. Chem. Chem. Phys., 2003, 5, 2308 DOI: 10.1039/B301882M

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