Synthesis and properties of BaCe1?xYxO3??aBaWO4 composite protonic conductors

Barium cerate doped by trivalent rare earth metal ions is a potentially huge component of materials for electrochemical industry due to its high protonic conductivity. However, the poor chemical stability especially in the presence of CO2, SO2 or H2O, resulting in decreasing the mechanical durabilit...

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Bibliographic Details
Published in:Journal of thermal analysis and calorimetry 2013-07, Vol.113 (1), p.405-412
Main Authors: Lacz, Agnieszka, Pasierb, Pawel
Format: Article
Language:English
Subjects:
Carbon dioxide
Conductors
Corrosion resistance
Differential thermal analysis
Resistivity
Synthesis
Thermal analysis
Thermal stability
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Summary:Barium cerate doped by trivalent rare earth metal ions is a potentially huge component of materials for electrochemical industry due to its high protonic conductivity. However, the poor chemical stability especially in the presence of CO2, SO2 or H2O, resulting in decreasing the mechanical durability of obtained materials, limits their possible applications. The new approach towards stable ceramic protonic conductors with high electrical conductivity is presented. Thermal stability of yttrium doped (10 mol%) of BaCeO3 was enhanced by forming the composite material BaCe0.9Y0.1O3aBaWO4 (10 mol% of BaWO4). The synthesis was performed by solid-state reaction method. The detailed study of thermal decomposition of starting powders mixture was performed using thermogravimetry and differential thermal analysis (TG/DTA) techniques combined with Evolved Gas Analysis (EGAamass spectrometry). Structure, phase composition and microstructure together with thermal stability of sintered materials were determined. The exposition tests were performed to characterise the stability of composites in carbon dioxide and water vapour-rich atmospheres. The samples were exposed to atmosphere containing CO2/H2O (7 % of CO2 in air, 100 % RH) at temperature of 25 degree C for 300 h. Thermal analysis supplied with mass spectrometry was applied to analyse the materials after the test. The results of this experiment showed better chemical resistance of composite materialaBaCe0.9Y0.1O3 with 10 mol% of BaWO4 compared to single phase material.
ISSN:1388-6150
1572-8943
DOI:10.1007/s10973-013-3071-x