Abstract
Many material systems have known or predicted functional phases that are metastable at standard temperature and pressure. While substantial advances have been made in the high-Throughput and combinatorial synthesis of materials with a range of stoichiometries, investigation of thermal processing remains largely the domain of iterative uniform anneals or static gradients. Here we develop X-ray probed laser anneal mapping (XPLAM), a high throughput technique coupling spatially resolved X-ray diffraction with microsecond to millisecond laser gradient anneals to produce temperature-dwell-Transformation (TDT) diagrams of the phase as a function of quench time and temperature. In addition to showing regimes where specific metastable phases form preferentially, TDT diagrams provide insight into the submillisecond kinetics of solid-solid phase transitions. This is a unique tool for mapping reaction pathways for metastable phases. As a first demonstration of XPLAM, we study Bi2O3, which has a rich set of polytypes, including the -phase with an exceptionally high oxygen ion conductivity. We demonstrate the first annealing-driven synthesis of room temperature -Bi2O3. We expect XPLAM to prove a powerful technique for rapid identification of synthetic routes to metastable phases and to generate the exhaustive data sets required for machine learning-guided exploration of materials processing.
Original language | American English |
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Pages (from-to) | 4328-4336 |
Number of pages | 9 |
Journal | Chemistry of Materials |
Volume | 33 |
Issue number | 12 |
DOIs | |
State | Published - 22 Jun 2021 |
Bibliographical note
Publisher Copyright:©
NREL Publication Number
- NREL/JA-5K00-78639
Keywords
- Bi2O3
- laser annealing
- metastable oxide
- thermal processing