|About this Abstract
||Materials Science & Technology 2019
||Late News Poster Session
||P1-30: On the Decomposition of Cerium Aluminate into Aluminum Oxide and Cerium Oxide
||Aaron C. Johnston-Peck, Russell A. Maier
|On-Site Speaker (Planned)
||Aaron C. Johnston-Peck
Cerium aluminate (CeAlO3), a (distorted) perovskite structure, was synthesized using traditional powder processing techniques. Upon heating in oxidizing conditions these CeAlO3 powders undergo a solid-state reaction and decompose into aluminum oxide (Al2O3) and cerium oxide (CeO2). Electron microscopy, X-ray diffraction (XRD), and differential scanning calorimetry (DSC) were used to track this eutectoid transformation and characterize the resultant microstructure. The product of the eutectoid decomposition is a fine microstructure comprised of interdigitated CeO2 and Al2O3 domains. Domain size is sensitive to annealing conditions and coarsens with time. The reaction is found to nucleate at the CeAlO3 surface and CeO2 and Al2O3 cooperatively consume the parent crystal. Several orientation relationships were observed between CeO2 and CeAlO3 which is hypothesized to account for some of the observed heterogeneity in the final product. This unique microstructure may have favorable applications in catalysis and studies are ongoing.