A mixed-conducting Ba0.5Sr0.5Co0.8Fe0.2O3−δ (BSCF5582)-based composite was developed by addition of ZrO2 and iso-molar excess BaO to introduce BaZrO3-based secondary phase particles. It was revealed that as-synthesized composite could get well-distributed secondary phase particles and fine-grained microstructure due to the grain growth inhibition of the secondary phase particles. For the composite with addition of 10mol%ZrO2 + 10mol%BaO, a well-developed and fine-grained microstructure was obtained. Compared to the pure phase BSCF5582, the three-point bending strength of the composite with addition of 5mol%ZrO2 + 5mol%BaO increased by 68% and its O permeation rate was much higher below 830C with the smaller apparent activation energy.

Fabrication, Microstructure, Mechanical Strength and Oxygen Permeation of Ba(Sr)Zr(CoFe)O3 Particle-Dispersed Ba0.5Sr0.5Co0.8Fe0.2O3-δ Mixed-Conducting Composites. D.Li, W.Liu, H.Zhang, G.Jiang, C.Chen: Materials Letters, 2004, 58[10], 1561-4