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Meeting Materials Science & Technology 2020
Symposium Grain Boundaries, Interfaces, and Surfaces in Functional Materials: Fundamental Structure-Property-Performance Relationships
Presentation Title Grain Boundary Engineering ZnAl2O4 via Rare Earth (RE) Doping with Varying Ionic Radii
Author(s) Luis Enrique Sotelo Martin, Ricardo H.R. Castro
On-Site Speaker (Planned) Luis Enrique Sotelo Martin
Abstract Scope Nanocrystalline ZnAl2O4 powder was synthesized with 0.5 mol% (RE)2O3 (RE=Nd, Y, Sc, In) using reverse-strike coprecipitation. RE dopants were chosen to span a range of crystal ionic radii (88.5 to 112.3 ppm) in order to study segregation behavior in ZnAl2O4. Resulting powders were analyzed with x-ray diffraction and electron microscopy where Nd exhibited the highest degree of grain boundary segregation. Microcalorimetry measurements were used to analyze the powders’ grain boundary and surface energies. The data showed a correlation between dopant characteristics and interfacial energies, with consequences to stability against coarsening for doped ZnAl2O4. Nanoindentation experiments on pellets sintered with high-pressure spark plasma sintering (HP-SPS) revealed Vickers hardness is dependent on doping chemistry which may be explained by the effects of dopants on grain boundaries. These results have implications for the future of grain boundary engineering as we continue to understand mechanical properties of nanocrystalline ceramics.
Proceedings Inclusion? Undecided


A Survey of Constrained Grain Boundary Migration Mechanisms
Advanced TEM of Interfaces and Defects in Functional Ceramics
Anisotropy at Interfaces in Rare-earth Pyrosilicates for High-temperature Coatings
Effect of Electrode Composition and Potential on Moisture Incorporation and Degradation in Dielectrics and Piezoelectrics
Electromigration-induced Defects' Evolution in Polycrystalline Interconnects: Insights from Phase-field Simulations
Equilibrium and Kinetic Shapes of Grains in Polycrystals
Grain Boundary Engineering ZnAl2O4 via Rare Earth (RE) Doping with Varying Ionic Radii
Implications of Ferroelectricity in Perovskite Solar Cells
Phase Stability of Sr1-xBaxMnO3 (0 ≤ x ≤ 0.5) Films Using Combinatorial Substrate Epitaxy
Relating Grain Size Distributions and Grain Boundary Excess Coverages to Complexion Transitions in Eu-doped MgAl2O4
The Impact of Metastable Grain Boundary States on Mobility in FCC Metal
Thermal Property of Diamond Thin Film on Si (100) Substrate
Vacancy-enhanced Grain Boundary Migration

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