Electrical and thermal properties of doped strontium titanate-based composites, (La,Sr)TiO3-(Ce,La)O2 and (Y,Sr)TiO3-(Ce,Y)O2, were studied in relation to their potential use as solid oxide fuel cell (SOFC) anode materials. Depending on the cerium content and the oxygen partial pressure, an electrical conductivity on the order of 0.01-220 S/cm at 800-1000oC was measured using a four-probe conductivity technique. The thermal expansion of these composites was close to that of yttria-stabilized zirconia (YSZ). Relatively minor chemical expansion or contraction was observed in materials with a Ti/Ce ratio greater than one when exposed to a wide variation in oxygen partial pressures. These composites will potentially be tolerant to repeated reduction-oxidation cyclings in SOFCs. The composites with the Ti/Ce?1 expanded significantly when exposed to a reducing atmosphere.
Revised: November 10, 2005 |
Published: August 1, 2003
Citation
Marina O.A., and J.W. Stevenson. 2003.Electrical and Thermal Properties of Strontium Titanate-Based Compounds. In Solid State Ionic Devices III: Proceedings of the International Symposium, edited by Wachsman, ED., et al, 2002-26, 91-100. Pennington, New Jersey:Electrochemical Society, Inc.PNNL-SA-37463.