Microstructure and electrical properties of the composites based on SrTi0.5Fe0.5O3 (- delta) and Ce-0.8(Sm0.8Sr0.2)(0.2)O2 - delta

作者：Pikalova E Yu^*; Murashkina A A; Medvedev D A; Pikalov P S; Plaksin S V

来源：Solid State Ionics, 2014, 262: 640-644.

DOI：10.1016/j.ssi.2013.10.036

• MIEC membranes
• SOFC
• Composite anode materials
• Fluorite
• Perovskite

New composite materials with mixed oxygen ionic and electronic conductivity based on perovskite SrTi0.5Fe0.5O3 - delta and fluorite Ce-0.8(Sm0.5Sr0.2)(0.2)O2 - delta were prepared by mixing base components synthesized by the solid state reaction method with following joint calcination at 1573 K and sintering in a gas-tight ceramic at 1623-1823 K. The phase content, microstructure and surface morphology, thermal expansion of sintered samples and their electrical properties were investigated by XRD, scanning electron microscopy, dilatometric method and four-probe dc technique, respectively. It was found that the composite materials are two-phase perovskite-fluorite systems with chemically stable content, characterized by the smallness of grain size relative to Ce-0.8(Sm0.5Sr0.2)(0.2)O2 - delta and considerably higher microhardness in comparison with SrTi0.5Fe0.5O3 - delta. They possess intermediate values of thermal and chemical expansion, and high level of ionic and n-type electronic conductivity, making these composite materials promising candidates as mixed ionic and electronic conducting ceramic membranes for a wide variety of gas separation applications, including oxygen separation, partial oxidation of methane and hydrogen separation and as anodes for solid oxide fuel cells (SOFCs).

• 出版日期2014-9-1