TY - GEN
T1 - High temperature strength and elastic properties of doped ceria under various oxygen partial pressures
AU - Taguchi, T.
AU - Watanabe, S.
AU - Sato, K.
AU - Hashida, T.
N1 - Publisher Copyright:
© The Electrochemical Society.
PY - 2015
Y1 - 2015
N2 - Fracture strength and Young's modulus of ceria doped with 10 mol.% Gd and 10, 20 and 30 mol.% Y were investigated by means of small punch testing method under controlled temperature (1073 K) and oxygen partial pressure (log((p(O2)/atm)= -1.1, 17.5, -21.4, -22.0). Under the reducing conditions, the color of fractured doped ceria specimen changed from pale yellow to gray; it is therefore indicated that oxygen nonstoichiometry affects mechanical properties of the doped ceria. Under low oxygen partial pressure, Young's modulus of all specimens decreased monotonically. The fracture strength, by contrast, increased at log(p(O2)/atm) = -17.5, and lower oxygen partial pressures; each yttria doped ceria with different Y content showed different variation trends. The oxygen partial pressure dependence of the fracture strength of doped ceria could be arranged as a function of the reduction expansion of the lattice constant a/a0.
AB - Fracture strength and Young's modulus of ceria doped with 10 mol.% Gd and 10, 20 and 30 mol.% Y were investigated by means of small punch testing method under controlled temperature (1073 K) and oxygen partial pressure (log((p(O2)/atm)= -1.1, 17.5, -21.4, -22.0). Under the reducing conditions, the color of fractured doped ceria specimen changed from pale yellow to gray; it is therefore indicated that oxygen nonstoichiometry affects mechanical properties of the doped ceria. Under low oxygen partial pressure, Young's modulus of all specimens decreased monotonically. The fracture strength, by contrast, increased at log(p(O2)/atm) = -17.5, and lower oxygen partial pressures; each yttria doped ceria with different Y content showed different variation trends. The oxygen partial pressure dependence of the fracture strength of doped ceria could be arranged as a function of the reduction expansion of the lattice constant a/a0.
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U2 - 10.1149/06801.0375ecst
DO - 10.1149/06801.0375ecst
M3 - Conference contribution
AN - SCOPUS:84938816374
T3 - ECS Transactions
SP - 375
EP - 385
BT - Solid Oxide Fuel Cells 14, SOFC 2015
A2 - Singhal, S. C.
A2 - Eguchi, K.
PB - Electrochemical Society Inc.
T2 - 14th International Symposium on Solid Oxide Fuel Cells, SOFC 2015; held as part of the Electrochemical Society, ECS Conference on Electrochemical Energy Conversion and Storage
Y2 - 26 July 2015 through 31 July 2015
ER -