Creep Behavior of Yb-Doped Barium Cerate Perovskite
Polycrystalline ytterbium-doped barium cerate with composition BaCe0.95Yb0.05O3- has been fabricated by solid state reaction. The compound has an orthorhombic perovskite structure and a fine and homogeneous grain size distribution, with a mean value of 0.4 m. The creep behavior was studied by means of constant crosshead-speed compression tests in air at temperatures of up to 1300 °C. At the lower strain rates and higher temperatures, the material deformed by grain boundary sliding; the corresponding true stress-true strain curves displayed an initial strength drop followed by an extended steady state stage. A continuous transition towards a brittle regime was observed with increasing initial strain rate and/or decreasing temperature.
Pietro VINCENZINI, Sheldon WIEDERHORN and Paolo COLOMBO
C. Vaquero-Aguilar and M. Jiménez Melendo, "Creep Behavior of Yb-Doped Barium Cerate Perovskite", Advances in Science and Technology, Vol. 65, pp. 238-243, 2010