About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Mesoscale Phenomena in Functional Polycrystals and Nanostructures
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| Presentation Title |
Intergranular Chemistry and Sintering of Metal Oxide Particle Powders |
| Author(s) |
Korbinian Aicher, Hasan Razouq, Thomas Schwab, Gregor Zickler, Oliver Diwald |
| On-Site Speaker (Planned) |
Oliver Diwald |
| Abstract Scope |
Configurations of composite metal oxide nanoparticles are typically far off their thermodynamic equilibrium state. As such they represent a versatile but so far overlooked source material for the intergranular solid-state chemistry inside ceramics. We explored the potential of vapor phase-grown MgO nanoparticles hosting Ba2+, In3+ and Fe3+ admixtures as precursors for engineered intergranular regions.[1,2]
During annealing-induced exsolution from the nanocrystal bulk into the grain interfaces, the impurity admixtures impact grain coarsening and powder densification, effects that were compared using an integrated characterization approach. Functional properties such as visible luminescence emission from intergranular BaO structures, the emergence of percolating and conductive MgIn2O4 networks inside an insulating host or ferrimagnetism from intergranular MgFe2O4 precipitates will be discussed.
[1] Schwab, T., et al; J. Amer. Ceram. Soc., 106 (2023) 897; doi.org/10.1111/jace.18833.
[2] Schwab T. et al.; ACS Appl. Mater. Interfaces 13 (2021) 25493; doi.org/10.1021/acsami.1c02931. |