Abstract
The sintering behavior of La1-xSrxMnO3 (LSM) was studied using porous electrodes of various compositions. Radii of particles at the surface, radii of imprints at the interface, and number of imprints per unit area were determined by SEM after heat treatment. Grain growth occurred mainly in the initial stage, and was suppressed by slow mass transfer in the successive stage. The activation energy of grain growth was calculated to be approximately 400kJ/mol. The relationship between the particle radii of the bulk electrode and the length of three-phase-boundary (TPB) at the interface was clarified. The overpotential change due to sintering over time was estimated using this relationship. It was suggested that porous LSM electrode can be operated over 100000h at 800°C without detectable decrease of TPB length.
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