Abstract
The steady-state demixing of initially homogeneous oxides in an oxygen potential gradient is studied theoretically and experimentally. In ternary oxides which are stable (i.e., not oxidized or reduced) in the oxygen potential range in question, the crystal between two different oxygen potentials is shifted with respect to the oxygen lattice system. If DA> DB≫ DO, the crystal is normally enriched in AO at the side of the higher oxygen potential. Solutions of the transport problem are presented and the predicted effects are verified experimentally. The following systems are studied: Complete oxide solid solutions (A, B)O; A-B-O systems with limited solid solution ranges and miscibility gaps; A-B-O systems with compound (e.g., spinel) formation.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
C. Wagner,Corros. Sci. 9, 91 (1969).
B. D. Bastow, D. P. Whittle, and G. C. Wood,Proc. R. Soc. Lond. 356, 177 (1977).
R. HaaseTransportvorgänge Grundzüge der Physikalischen Chemie III (Steinkopff, Darmstadt, 1973).
J. R. Manning,Diffusion Kinetics for Atoms in Crystals (D. van Nostrand, Princeton, N.J., 1968), pp. 212 ff.
H. Schmalzried, W. Laqua, and P. L. Lin,Z. Naturforsch. 34a, 192 (1979).
H. Schmalzried and A. D. Pelton,Ber. Bunsenges, Phys. Chem. 77, 91 (1973).
G. Schwier, R. Dieckmann, and H. Schmalzried,Ber. Bunsenges. Phys. Chem. 77, 402 (1973).
E. W. Schulz, Dissertation, Technische Universität Berlin, 1977.
H. Schmalzried,Point Defects in Ternary Ionic Crystals, inProgress in Solid State Chemistry, H. Reiss, ed. (Pergamon Press, Oxford, 1965).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Schmalzried, H., Laqua, W. Multicomponent oxides in oxygen potential gradients. Oxid Met 15, 339–353 (1981). https://doi.org/10.1007/BF01058834
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01058834