About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
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Glasses and Optical Materials: Challenges, Advances, and Applications
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| Presentation Title |
Understanding the Structural Role of Indium in Aluminoborosilicate Glass: A Multi-Spectroscopic Study
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| Author(s) |
Amir Ashjari, Andrew Lawrence Ogrinc, Ricardo Felipe Lancelotti, Randall Youngman, Henrik Bradtmüller, Myungkoo Kang, Seong Kim, Doris Möncke |
| On-Site Speaker (Planned) |
Amir Ashjari |
| Abstract Scope |
We present a systematic comparison of sodium-aluminoborosilicate glasses with 0-3 mol% indium or gallium oxide to investigate the structural role of indium and its effect on the controlled crystallization of tin-doped indium oxide (ITO) nanocrystals. A comprehensive spectroscopic analysis, Raman, infrared, XPS, NMR, and TEM, reveals that indium predominantly acts as a 4-coordinated conditional network former in glasses with >10 mol% Al2O3, transitioning to a 6-coordinated crystalline state upon heat treatment. Raman and IR spectra confirm that indium does not create additional non-bridging oxygens, preserving a highly connected Q4/Q4’ network. 11B NMR shows a reduction in [BO4]- units with indium addition, while XPS confirms changes in indium coordination. TEM mapping reveals nanoscale phase separation with indium enriched in silicon-rich regions, aiding nanocrystal formation while maintaining transparency. Density, packing density, and Tg trends support the spectroscopic results. This study provides the first direct evidence of indium as a conditional network former. |