Chemical expansion of La0.8Sr0.2Fe0.7Ga0.3O3–δ

This paper deals with the chemical expansion measurements and modelling of La0.8Sr0.2Fe0.7Ga0.3O3-δ. The expansion behavior has been evaluated using a dilatometer and X-ray diffraction over a wide range of temperatures (RT to 1373 K) and oxygen partial pressures (10−21 to 1 atm). The material stoich...

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Bibliographic Details
Published in:Solid state ionics 2011-06, Vol.193 (1), p.23-31
Main Authors: Valentin, Olivier, Millot, Francis, Blond, Éric, Richet, Nicolas, Julian, Aurelie, Véron, Emmanuel, Ory, Sandra
Format: Article
Language:English
Subjects:
Engineering Sciences
Materials
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Summary:This paper deals with the chemical expansion measurements and modelling of La0.8Sr0.2Fe0.7Ga0.3O3-δ. The expansion behavior has been evaluated using a dilatometer and X-ray diffraction over a wide range of temperatures (RT to 1373 K) and oxygen partial pressures (10−21 to 1 atm). The material stoichiometry evolution with temperature and oxygen partial pressure has been measured using thermogravimetry analysis at different oxygen partial pressure, from 10−21 to 0.5 atm and from RT to 1473 K. Considering a typical defect model for lanthanum ferrite oxides, chemical expansion depends linearly on the Fe4+ concentration rather than on the oxygen vacancy concentration. A model of chemical expansion as a function of pO2 and temperature is then proposed. It helps to understand and anticipate the chemical expansion behavior exhibited by this material when used as Ionic Transport Membrane (ITM).
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2011.04.006