TY - JOUR
T1 - Oxygen transport properties in ZrO2-CeO2-Y2O3 by SIMS analysis
AU - Naito, Hitoshi
AU - Sakai, Natsuko
AU - Otake, Takanori
AU - Yugami, Hiroo
AU - Yokokawa, Harumi
N1 - Funding Information:
This study was partly supported by a Grant-in-Aid for Scientific Research on Priority Areas (A) from the Ministry of Education, Science, Sports and Culture of Japan.
PY - 2000/11/1
Y1 - 2000/11/1
N2 - A mixed conductor, ZrO2-CeO2-Y2O3 (Ce-YSZ), exhibits anomalous electrical properties depending on oxygen partial pressure and CeO2 concentration. We measured surface reaction rates and oxygen tracer diffusion coefficients of YSZ with various CeO2 concentrations by secondary ion mass analyses. The Ce concentration dependence of oxygen tracer diffusion coefficient in air corresponds with that of the total electrical conductivity, over which the ionic conductivity is dominant. The surface exchange coefficient, however, had a higher value in the region of 20 to approximately 60 mol% CeO2 containing YSZ compared to other compositions. Ce-YSZ, which contains this region of CeO2 concentration, exhibits high electronic conduction at reducing conditions. The ionic and electronic conductivities are considered to affect the oxygen tracer diffusion coefficient and the surface exchange coefficient, respectively.
AB - A mixed conductor, ZrO2-CeO2-Y2O3 (Ce-YSZ), exhibits anomalous electrical properties depending on oxygen partial pressure and CeO2 concentration. We measured surface reaction rates and oxygen tracer diffusion coefficients of YSZ with various CeO2 concentrations by secondary ion mass analyses. The Ce concentration dependence of oxygen tracer diffusion coefficient in air corresponds with that of the total electrical conductivity, over which the ionic conductivity is dominant. The surface exchange coefficient, however, had a higher value in the region of 20 to approximately 60 mol% CeO2 containing YSZ compared to other compositions. Ce-YSZ, which contains this region of CeO2 concentration, exhibits high electronic conduction at reducing conditions. The ionic and electronic conductivities are considered to affect the oxygen tracer diffusion coefficient and the surface exchange coefficient, respectively.
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U2 - 10.1016/S0167-2738(00)00378-7
DO - 10.1016/S0167-2738(00)00378-7
M3 - Article
AN - SCOPUS:0034319936
SN - 0167-2738
VL - 135
SP - 669
EP - 673
JO - Solid State Ionics
JF - Solid State Ionics
IS - 1-4
ER -