About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
2026 Technical Division Student Poster Contest
|
| Presentation Title |
SPU-14: RbI – SrI2 Phase Diagram Development to Facilitate Scintillator Scale-Up |
| Author(s) |
Megan Gillespie, Kim Pestovich, Luis Stand |
| On-Site Speaker (Planned) |
Megan Gillespie |
| Abstract Scope |
Scintillators absorb ionizing radiation and emit visible light, making them useful for high-energy (6–9 MeV) X-ray imaging in national security applications. Improving X-ray image quality requires scintillators with high light yield, low afterglow, and good crystal quality. Recently discovered scintillators, RbSrI3:Eu and RbSr2I5:Eu, show promising performance, but their phase formation had not been reported, limiting the crystal growth optimization. This work investigates the full compositional relationship between RbI and SrI2 by constructing an experimental phase diagram. Materials were melt-synthesized in 5 mol% SrI2 increments and characterized using differential scanning calorimetry (DSC), X-ray powder diffraction, and high-temperature XRD. Three eutectic points were identified at approximately x(SrI2) = 0.30, 0.57, and 0.80, with only two compounds present: perovskite RbSrI3 and RbSr2I5. These results were applied to subsequent experiments testing the stability of RbSrI3 and RbSr2I5 to support crystal growth scale-up using the vertical Bridgman method. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Phase Transformations, Ceramics, |