An investigation of shelf-life of strontium doped LaMnO3 materials

The shelf-life of Sr doped LaMnO3 (LSM) materials of varying stoichiometric compositions prepared by wet chemical synthesis was investigated under storage conditions of low and high humidity at ambient temperature for similar to 350 days. It has been found that the adhesion, chemical stability and stability of the electrode performance of LSM materials are critically dependent on the A-site stoichiometry (i.e., (La+Sr)/Mn ratio) of the LSM materials and much less dependent on storage conditions (humidity level and storage time) over the period investigated. In this respect, LSM materials with stoichiometric and sub-stoichiometric compositions where (La+Sr)/Mn less than or equal to 1 are stable and LSM with A-site sub-stoichiometry ((La+Sr)/Mn less than or equal to similar to 0.9) is effective in achieving good adherence, high chemical stability and high stability of electrode performance. (C) 2000 Kluwer Academic Publishers.