Rapid Identification of Synthetic Routes to Functional Metastable Phases Using X-ray Probed Laser Anneal Mapping (XPLAM) Time-Temperature Quench Maps

Robert Bell, Peter Beaucage, Marc Murphy, Aine Connolly, Ulrich Wiesner, David Ginley, R. van Dover, Michael Thompson

Research output: Contribution to journalArticlepeer-review

7 Scopus Citations

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 languageAmerican English
Pages (from-to)4328-4336
Number of pages9
JournalChemistry of Materials
Volume33
Issue number12
DOIs
StatePublished - 22 Jun 2021

Bibliographical note

Publisher Copyright:
©

NREL Publication Number

  • NREL/JA-5K00-78639

Keywords

  • Bi2O3
  • laser annealing
  • metastable oxide
  • thermal processing

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