A search for temperature induced time-dependent structural transitions in 10 mol%Sc2O3-1 mol%CeO2-ZrO2 and 8 mol%Y2O3-ZrO2 electrolyte ceramics
Abbreviated Journal Title
J. Eur. Ceram. Soc.
Young's modulus; X-ray diffraction; Neutron diffraction; Scandia and; ceria stabilized zirconia; Yttria stabilized zirconia; OXIDE FUEL-CELLS; SCANDIA-DOPED ZIRCONIA; INTERNAL-FRICTION; STABILIZED; ZIRCONIA; RAMAN-SCATTERING; MECHANICAL LOSS; YOUNGS MODULUS; SPECTROSCOPY; SOFCS; CONDUCTIVITY; Materials Science, Ceramics
Both Sc2O3-CeO2-stabilized-ZrO2 (SCSZ) and Y2O3-stabilized-ZrO2 (YSZ) show similar Young's modulus damping at 175-400 degrees C and 200-400 degrees C, respectively, by impulse excitation acoustic technique. The phase transition in SCSZ is considered responsible for the damping; however for YSZ, such a phase transition has never been reported. To clarify the relation of damping and structural transition in these two materials, the time-dependent high temperature stabilities are studied by in situ X-ray diffraction, neutron diffraction and Raman scattering during long-term annealing of SCSZ at 350 degrees C and YSZ at 275 degrees C. The cubic-to-rhombohedral transition in SCSZ is detected. However, the existence of t' phase in YSZ raw powders is confirmed without significant changes of the cubic structure during isothermal annealing. It is concluded that the phase transition contributes to the Young's modulus damping in SCSZ, while the structural transition is excluded from the reason for damping in YSZ. (C) 2014 Elsevier Ltd. All rights reserved.
Journal of the European Ceramic Society
"A search for temperature induced time-dependent structural transitions in 10 mol%Sc2O3-1 mol%CeO2-ZrO2 and 8 mol%Y2O3-ZrO2 electrolyte ceramics" (2015). Faculty Bibliography 2010s. 6465.