Preparation and characterization of La 1– xSr xMnO 3+ δ (0⩽ x⩽0.6) powder by sol–gel processing

La 1– x Sr x MnO 3+ δ oxides with 0⩽ x⩽0.6 were synthesized via sol–gel route (Pechini process). The gel decomposition was studied by several thermal analysis methods. After calcination at 1000 °C of the dried gels, the oxides were characterized by X-ray diffraction, thermal analyses, transmission a...

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Bibliographic Details
Published inSolid state sciences Vol. 4; no. 1; pp. 125 - 133
Main Authors Gaudon, Manuel, Laberty-Robert, Christel, Ansart, Florence, Stevens, Philippe, Rousset, Abel
Format Journal Article
LanguageEnglish
Published Elsevier Masson SAS 2002
Subjects
Lanthanum strontium manganite oxide
Morphology
Pechini process
Structural characterization
Synthesis
Pechini process
Lanthanum strontium manganite oxide
Synthesis
Structural characterization
Morphology
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Summary:La 1– x Sr x MnO 3+ δ oxides with 0⩽ x⩽0.6 were synthesized via sol–gel route (Pechini process). The gel decomposition was studied by several thermal analysis methods. After calcination at 1000 °C of the dried gels, the oxides were characterized by X-ray diffraction, thermal analyses, transmission and scanning electron microscopies and chemical analyses. In order to correlate the Mn 4+/Mn 3+ ratio with the symmetry of the structure and the particle size, the nonstoichiometry level at room temperature, δ, was determined by two methods: chemical titration and temperature programmed reduction. It is shown that a negative correlation exists between the strontium content and the nonstoichiometry level, i.e., at low Sr content the oxygen content is higher. To define the best material composition for use as a solid oxide fuel cell (SOFC) cathode, a comparison was made between δ values at room temperature and SOFC operating temperature (1000 °C). Graphic
ISSN:1293-2558
1873-3085
DOI:10.1016/S1293-2558(01)01208-0