TY - JOUR
T1 - Study of Oxygen Vacancies in Ceramics by Perturbed Angular Correlation Spectroscopy
AU - Su, Han‐Tzong ‐T
AU - Wang, Ruiping
AU - Fuchs, Heinz
AU - Gardner, John A.
AU - Evenson, William E.
AU - Sommers, James A.
PY - 1990/11
Y1 - 1990/11
N2 - Perturbed angular correlation (PAC) measurements in tetragonal and cubic zirconia and in ceria are described. A physically reasonable and self‐consistent interpretation of these data implies that oxygen vacancies are trapped at a second‐neighbor position by Cd in tetragonal zirconia and by In in ceria. For Cd in tetragonal zirconia, the vacancy trap energy is found to be 0.44 eV, and the energy barrier between adjacent trap sites is approximately 0.8 eV. The activation energy of an oxygen vacancy hopping between trap sites around 111Cd in ceria is found to be 0.55 eV. The activation energy for oxygen vacancy hopping in cubic zirconia, as detected by 181Ta PAC, is about 1.0 eV and independent of the Y concentration.
AB - Perturbed angular correlation (PAC) measurements in tetragonal and cubic zirconia and in ceria are described. A physically reasonable and self‐consistent interpretation of these data implies that oxygen vacancies are trapped at a second‐neighbor position by Cd in tetragonal zirconia and by In in ceria. For Cd in tetragonal zirconia, the vacancy trap energy is found to be 0.44 eV, and the energy barrier between adjacent trap sites is approximately 0.8 eV. The activation energy of an oxygen vacancy hopping between trap sites around 111Cd in ceria is found to be 0.55 eV. The activation energy for oxygen vacancy hopping in cubic zirconia, as detected by 181Ta PAC, is about 1.0 eV and independent of the Y concentration.
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U2 - 10.1111/j.1151-2916.1990.tb06440.x
DO - 10.1111/j.1151-2916.1990.tb06440.x
M3 - Article
AN - SCOPUS:0000708088
SN - 0002-7820
VL - 73
SP - 3215
EP - 3219
JO - Journal of the American Ceramic Society
JF - Journal of the American Ceramic Society
IS - 11
ER -