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.
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