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 sto rage conditions of low and high humidity at ambient temperature for similar to 350 days. It has been found that the adhesion, chemical stability and s tability of the electrode performance of LSM materials are critically depen dent on the A-site stoichiometry (i.e., (La+Sr)/Mn ratio) of the LSM materi als and much less dependent on storage conditions (humidity level and stora ge time) over the period investigated. In this respect, LSM materials with stoichiometric and sub-stoichiometric compositions where (La+Sr)/Mn less th an 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 adh erence, high chemical stability and high stability of electrode performance . (C) 2000 Kluwer Academic Publishers.