焼結に伴うLa_<1-x>Sr_xMnO_3-イットリア安定化ジルコニア-空気の三相界面長の変化

概要

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The sintering behavior of La_<1-x>Sr_xMnO_3(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 pre 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 grwoth was calculated to be approximately 400 kJ/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 100000 h at 800℃ without detectable decrease of TPB length.
社団法人日本セラミックス協会の論文
1999-03-01