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On Oxygen Diffusion in tetragonal zirconia
Author(s) -
Oberländer Barbara,
Kofstad Per,
Kvernes Ingard
Publication year - 1988
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.19880190604
Subject(s) - tetragonal crystal system , cubic zirconia , stoichiometry , diffusion , oxygen , materials science , analytical chemistry (journal) , oxide , chemistry , crystallography , thermodynamics , metallurgy , crystal structure , physics , chromatography , organic chemistry , ceramic
Oxygen diffusion in dense scales of tetragonal zirconia at 1100–1300°C has been studied by the so‐called interruption kinetic method (or the Rosenberg method). Assuming that oxygen vacancies are the predominant defects in zirconia (ZrO 2 ), studies by this method provide values of the oxygen self diffusion coefficient in this oxide at its lower limit of stability, D 0 * , and the value in tetragonal zirconia can be expressed as D 0 *=2.2 · 10 −3 exp (−140(kJ/mole)/RT). The studies furthermore show that the maximum non‐stoichiometry in tetragonal zirconia, X in ZrO 2−x , is small and has a value about x* ∼ 0.03 at 1000–1300°C.