Eutectoid decompositions in Ce-containing ABO₃ perovskites: Part I, the case of cooperative growth in CeAlO₃

Oxidation of perovskite CeAlO(3 )results in the eutectoid transformation to CeO2 and Al2O3. This phase transformation was recorded using thermal gravimetric analysis, X-ray diffraction, and scanning transmission electron microscopy. Lamellar features in the resultant microstructure indicate cooperative growth. Processing conditions dictate the lamellae sizes, which can be as small as a few nanometers, and coarsen into large domains with additional high temperature annealing.