ChemInform Abstract: Preparation and Characterization of Pr1-xSrxMnO3.+-.δ (x = 0, 0.15, 0.3, 0.4, 0.5) as a Potential SOFC Cathode Material Operating at Intermediate Temperatures (500—700 °C).
✍ Scribed by G. CH. KOSTOGLOUDIS; N. VASILAKOS; CH. FTIKOS
- Publisher
- John Wiley and Sons
- Year
- 2010
- Weight
- 37 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0931-7597
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✦ Synopsis
Preparation and Characterization of Pr 1-x SrxMnO 3±δ (x = 0, 0.15, 0.3, 0.4, 0.5) as a Potential SOFC Cathode Material Operating at Intermediate Temperatures (500-700 • C).
-Sr-doped title praseodymium manganite powders are prepared by citrate synthesis and pyrolysis and characterized by powder XRD and measurements of the thermal expansion and the electric conductivity. The single-phase oxides (orthorhombic, Pbcm) crystallize with perovskite-type structure. With increasing Sr content both the thermal expansion coefficient (TEC) and the electric conductivity increase while the activation energy decreases. Among the examined oxides, Pr 0.5 Sr 0.5 MnO 3±δ , exhibiting a linear TEC value of 12.2 x 10 -6 cm (cm • C) -1 , which is almost equal to those of doped CeO 2 electrolytes used in methanol SOFCs, and an electrical conductivity of 226 S cm -1 at 500 • C, is the most promising cathode material for intermediate-temp. SOFCs. -(KOSTOGLOUDIS, G.