Low-temperature sintering and phase changes in chromite interconnect materials

摘要

Sintering shrinkage curves and phase changes were compared for calcium-substituted lanthanum chromates with either slight Asite enrichment or depletion. Of the former type, La(sub 0.7)Ca(sub 0.31),CrO(sub 3) that was synthesized by the glycine-nitrate method sintered to high density in air at 1250C, exhibiting two rapid-shrinkage events. Weight loss measurements corroborated XRD data showing that, prior to densiflcation, over half the Ca resided in non-perovskite phases, including CaCrO(sub 4). In the La(sub 0.7)Ca(sub 0.31)CrO(sub 3), densification was closely associated with re-dissolution of the Ca into the perovskite.