Premium
Study of Oxygen Vacancies in Ceramics by Perturbed Angular Correlation Spectroscopy
Author(s) -
Su HanTzong,
Wang Ruiping,
Fuchs Heinz,
Gardner John A.,
Evenson William E.,
Sommers James A.
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb06440.x
Subject(s) - tetragonal crystal system , cubic zirconia , vacancy defect , oxygen , activation energy , materials science , ceramic , chemistry , crystallography , crystal structure , metallurgy , organic chemistry
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 111 Cd in ceria is found to be 0.55 eV. The activation energy for oxygen vacancy hopping in cubic zirconia, as detected by 181 Ta PAC, is about 1.0 eV and independent of the Y concentration.