About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
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ACerS Robert B. Sosman Award Symposium: Bridging the Gap between Atomistic and Continuum Approaches to Interface Science
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Presentation Title |
Microstructure Evolution in Thin Film Yttria-doped Barium Zirconate |
Author(s) |
Dylan Jennings, Ivar E. Reimanis, Sandrine Ricote, Jose Santiso |
On-Site Speaker (Planned) |
Ivar E. Reimanis |
Abstract Scope |
Microstructure evolution in mixed metal oxides exposed to various redox conditions is important to understand for applications such as catalysis, solid oxide fuel cells, and solar thermal water splitting. The present work examines the behaviors of thin films comprising yttria-doped barium zirconate (BZY), a classical proton conductor, under various environmental conditions. It is shown that the chemical and morphological stability of the films decreases when Ni is added; in contrast, the presence of Fe, either as an impurity or added intentionally, enhances film stability. Exsolution of metallic Ni from solution in the BZY at the film surface readily occurs under reducing conditions. The exsolved particles display a unique crystallographic relationship with the BZY, unlike Ni particles formed via dewetting experiments where several orientations were observed. The Ni/BZY interface energy was determined with a Winterbottom analysis and results are discussed in the context of microstructure evolution and stability of the films. |