AN OPTICAL IN-SITU STUDY OF THE RE-OXIDATION KINETICS OF CALCIA-STABILIZED ZIRCONIA

Authors
HE T BECKER KD TANNHAUSER DS
Citation
T. He et al., AN OPTICAL IN-SITU STUDY OF THE RE-OXIDATION KINETICS OF CALCIA-STABILIZED ZIRCONIA, Berichte der Bunsengesellschaft fur Physikalische Chemie, 99(4), 1995, pp. 658-666
Citations number
43
Categorie Soggetti
Chemistry Physical
Journal title
Berichte der Bunsengesellschaft fur Physikalische Chemie
ISSN journal
00059021 → ACNP
Volume
99
Issue
4
Year of publication
1995
Pages
658 - 666
Database
ISI
SICI code
0005-9021(1995)99:4<658:AOISOT>2.0.ZU;2-7
Abstract
The re-oxidation kinetics of strongly reduced single crystals of calci a-stabilized zirconia (black CSZ) have been investigated by an optical in-situ method at temperatures between 335 and 520 degrees C. The kin etics obey a parabolic rate law. From the analysis of the optical resu lts it follows that the parabolic rate constant, k(p), is controlled b y the ionic conductivity of the oxygen ions. The temperature dependenc e of k(p) can be represented by an Arrhenius-type equation with an act ivation energy of 1.05 eV. The nature of-the defect center associated with black CSZ is discussed in connection with its oscillator strength .