| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces in Functional Materials: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
Phase Stability of Sr<sub>1-x</sub>Ba<sub>x</sub>MnO<sub>3</sub> (0 ≤ x ≤ 0.5) Films Using Combinatorial Substrate Epitaxy |
| Author(s) |
Catherine Zhou, Paul Salvador, Gregory Rohrer, Marc De Graef |
| On-Site Speaker (Planned) |
Catherine Zhou |
| Abstract Scope |
Combinatorial substrate epitaxy is a high throughput film-growth method used herein to study the orientation relationships (ORs) and polytypic stability for (Sr,Ba)MnO<sub>3</sub> films grown on polycrystalline (Sr,Ba)TiO<sub>3</sub> substrates. (Sr,Ba)MnO<sub>3</sub> forms in either four-layered hexagonal (4H) or metastable three-layered cubic (3C) perovskite polytypes, depending on composition, deposition conditions, and substrate orientation. The range of substrate orientations stabilizing the 3C polytypes expands from (001) to (111) as temperature is increased or oxygen activity is decreased. 3C-SrMnO<sub>3</sub> polycrystalline films were stabilized over all of orientation space, while 3C-Ba<sub>0.5</sub>Sr<sub>0.5</sub>MnO<sub>3</sub> films grew on near-(001) substrate grains. Electron backscatter diffraction data was analyzed using dictionary indexing to determine the following ORs, which hold true regardless of the substrate surface orientation: (001)[100]<sub>4H film</sub>||(111)[1-10]<sub>3C substrate</sub> and (111)[1-10]<sub>3C film</sub>||(111)[1-10]<sub>3C substrate</sub>. These ORs align the eutactic planes and directions; its ubiquity indicates the interface energy is generally lower for the eutactic OR than for all other possible ORs. |