SHS and Properties of Perovskite La0.7Sr0.3MnO3 Powders by Using Dual Oxidants

Xue Min Yan; Yuan Zhu Mi; Lin Xiong

doi:10.4028/www.scientific.net/AMR.287-290.671

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 287-290SHS and Properties of Perovskite La0.7Sr0.3MnO3...

SHS and Properties of Perovskite La_0.7Sr_0.3MnO₃ Powders by Using Dual Oxidants

Abstract:

Self-propagating High-temperature Synthesis (SHS) was used to prepare complex oxide La_0.7Sr_0.3MnO₃, which is used as the cathode in solid oxide fuel cells (SOFCs). Experiments show that La_0.7Sr_0.3MnO₃ can be prepared via SHS under moderate conditions from a mixture of La₂O₃-SrO₂-Mn-NaClO₄-KMnO₄，using NaClO₄-KMnO₄ as dual oxidants. The proper addition of the second phase oxidant KMnO₄ makes the combustion wave movement stable. The product powders have an average particle size of 1-2μm and the particles are small aggregate. Pellets were sintered at 900 °C, 30 MPa for 10 min by spark plasma sinter (SPS). The electrical conductivity of sintered sample was 170 S•cm^-1 at 1000 °C in air.