About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
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| Symposium
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Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
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| Presentation Title |
Orientation-Dependent Surface Energies in Nanocrystalline Y2O3 and Their Role in Sintering
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| Author(s) |
Kavan Sanjaykumar Joshi, Jeremy Mason, Ricardo Castro |
| On-Site Speaker (Planned) |
Kavan Sanjaykumar Joshi |
| Abstract Scope |
Surface and grain boundary energies play an important role in the thermodynamic stability and sintering of nanoceramics due to the large interfacial areas at nanoscale. During sintering, the driving force is the reduction of interfacial energy. However, experimental data on orientation-specific surface energies are lacking. To address this gap, faceted nanocrystalline Y2O3 was synthesized in three morphologies including nanoparticles, nanosheets, and nanorods using co-precipitation and hydrothermal synthesis. Morphology and surface orientations were studied using electron microscopy. Surface energies of specific crystallographic planes were determined through water adsorption calorimetry. Spark Plasma Sintering was used to sinter nanoparticles and nanosheets into dense disks, and the influence of surface orientation anisotropy on mechanical properties was evaluated. Molecular dynamics simulations were conducted to estimate free surface energies as a function of orientation and validate experimental results. These findings established quantitative relationships between surface orientation, interfacial energies and sintering driving force in nanocrystalline Y2O3. |