About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Neutron and X-ray Scattering in Materials Science
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Presentation Title |
In Situ X-ray Diffraction Study of the (Ba,Sr)TiO<sub>3</sub> Solid State Reaction |
Author(s) |
Leah Bellcase, Corrado Harper, Elizabeth Dickey, Jennifer Sue Forrester, Jacob Jones |
On-Site Speaker (Planned) |
Jennifer Sue Forrester |
Abstract Scope |
In situ high-temperature X-ray diffraction was used to investigate the phase evolution of precursors used to synthesize xBaTiO<sub>3</sub>-1-xSrTiO<sub>3</sub> (BST), a potential component in multilayer capacitors. While single-phase materials are expected over large composition ranges, the system may not achieve full equilibrium during processing and retain secondary phases, leading to diminished properties in the final material. The kinetics of the phase formation may be influenced by processing conditions, and the composition and physical properties of the precursor materials.
Experiments monitored the time-dependent reactions and solid-state phase transformations of the individual precursors (BaCO<sub>3</sub>, SrCO<sub>3</sub>, and TiO<sub>2</sub>), and combinations of precursors. Phase transitions were observed during heating of binary oxides, and in combination with TiO<sub>2</sub>. The BaCO<sub>3</sub> and SrCO<sub>3</sub> series showed lattice interdiffusion creating an intermediate phase, which then separated into high temperature BaCO<sub>3</sub> and SrO phases. Interestingly, intermediate phases were not prerequisite in the formation of the final perovskite BST at ~950°C. |
Proceedings Inclusion? |
Planned: |
Keywords |
Electronic Materials, Phase Transformations, Characterization |