| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Phase Transformations in Ceramics: Science and Applications
|
| Presentation Title |
Phase Control of Polytypic Ba0.5Sr0.5MnO3 Films on Polycrystalline Substrates |
| Author(s) |
Catherine Zhou, Gregory Rohrer, Paul Salvador |
| On-Site Speaker (Planned) |
Catherine Zhou |
| Abstract Scope |
We investigate the role of oxygen partial pressure, strain, and substrate orientation on the phase stability of polytypic Ba0.5Sr0.5MnO3 (BSMO) thin films using combinatorial substrate epitaxy (CSE), which is a high throughput film growth method on polycrystalline substrates. The lowest energy structure for BSMO is the hexagonal (4H) perovskite, which differs from the cubic (3C) structure in the stacking sequence of nearly close-packed planes. The challenge is to stabilize 3C-BSMO using pulsed laser deposition and to evaluate the feasibility of stabilizing 3C films with greater Ba-content. Films are characterized from electron backscatter diffraction data using a dictionary indexing approach to identify the local phase and orientation relationship. We find that (100) 3C-BSMO is stabilized at 60 nm on near-(100) substrate orientations, which is thicker than previous studies on single crystals and suggests that the role of strain is not as significant on phase stability as oxygen activity during growth. |