SHS and properties of Perovskite La_(0.7)Sr_(0.3)MnO_3 Powders by Using Dual Oxidants

摘要

Self-propagating High-temperature Synthesis (SHS) was used to prepare complex oxide La_(0.7)Sr_(0.3)MnO_3, which is used as the cathode in solid oxide fuel cells (SOFCs). Experiments show that La_(0.7)Sr_(0.3)MnO_3 can be prepared via SHS under moderate conditions from a mixture of La_2O_3-SrO_2-Mn-NaClO_4-KMnO_4, using NaClO_4-KMnO_4 as dual oxidants. The proper addition of the second phase oxidant KMnO_4 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.