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Meeting MS&T23: Materials Science & Technology
Symposium Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
Presentation Title Thermo-kinetic Analysis of Zinc Aluminate Nanoparticles Coarsening
Author(s) Ricardo Castro
On-Site Speaker (Planned) Ricardo Castro
Abstract Scope The thermal stability of zinc aluminate nanoparticles is critical for their use as catalyst supports. In this study, we experimentally show that doping with 0.5 mol % Y2O3 improves the stability of zinc aluminate nanoparticles. The dopant spontaneously segregates to the nanoparticle surfaces in a phenomenon correlated with excess energy reduction. We performed a thermo-kinetic analysis to individually separate contributions. Direct measurements of surface thermodynamics confirmed the decreasing trend in surface energy from 0.99 for undoped to 0.85 J/m2 for Y-doped nanoparticles. Diffusion coefficients calculated from coarsening curves for undoped and doped compositions at 850 C were 4.8 10–12 cm2/s and 2.5 10–12 cm2/s, respectively, indicating the coarsening inhibition induced by Y3+ results from a combination of a reduced driving force (surface energy) and decreased atomic mobility.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Molecular Dynamics Based Atomistic-scale Study to Investigate Mechanical Properties of Σ3 Incoherent Non-Arrhenius Grain Boundary
A Potential Mechanism for Abnormal Grain Growth in Thin Films on c-sapphire
Addressing the Stability and Reliability Challenges in Perovskite Solar Cells via Microstructural and Interfacial Tailoring
Anisotropic Interface Motion in Polycrystalline Films
Anisotropy of Electric Field Effects on Grain Boundary Core Structures
Blacklight Sintering of Ceramics
Characterization of Grain Boundary Phase Transformations
Charged Dislocations in Ionic Ceramics
Chemical Ordering Delays Grain Boundary Complexion Transitions in NbMoTaW
Cold-rolling of NiTiCu Shape Memory Alloys at Different Temperatures and Post-deformation Annealing and the Study of Interplay between Rolling Temperature, Microstructure, Mechanical and Physical Properties
Correlation Between Segregation Behaviors of Ca and Y Doping Atoms and Mechanical Properties in Magnesium Aluminate Spinel
Direct Observation of Anisotropic Growth of Nickel Oxide Nanostructure by the Terrace-ledge-kink Mechanism
Disordered Interfaces in Nanocrystalline Al-Ni-Ce: Origins of Microstructural Stability and Mechanical Performance
Elemental Segregation in Iron Strontium Titanate Solid Solutions
Examining Multiple Generations of Complexion Transitions in Eu-doped MgAl2O4
F-1: Understanding the Influence of Interfaces on the Texture Development in Mg-(Ca, Zn) Alloys during Recrystallization
Grain Boundary–property Relation in an Improper Ferroelectric Polycrystal
Grand Canonical Optimization of Symmetric Tilt Grain Boundary Structure in Hexagonal Close-packed Titanium
Highly Conductive Grain Boundaries in Cold Sintered BaZr0.7Ce0.2Y0.1O3-δ Proton Conductors
In-situ Air-free 4D-STEM Biasing of Model Lithium-sulfur Batteries
In-situ Measurement of Interfacial Energies at High Temperature Using Micromechanics and Microscopy
Influence of Ba Non-stoichiometry and Dopants on the Processing and Properties of Doped BaZrO3
Investigation of Grain Boundaries in SrTiO3: Correlation of Space Charge and Non-Arrhenius Grain Growth
Mixed Ionic Electronic Conduction Caused by Phase Transformation and Interfacial Segregation in an Entropy Stabilized Oxide
Modeling SiN Crystallization in Microelectronics Manufacturing Using Phase-field Method
Predicting Grain Boundary States and Transitions in Ferroelectrics
Predicting Interface Stability and Oxygen Vacancy Formation at Misfit Dislocations in CeO2/SrTiO3 Heterostructures
Segregation Engineering in Metal Oxide Nanoparticle-derived Ceramics
Structural Defects and Functional Interfaces in Epitaxial Thin Films of Complex Oxide Materials
The effects of large pores on grain growth behavior in calcia doped alumina
The Formation of Stacking Faults in Barium Zirconate Type Perovskites
The Role of Grain Boundary Stiffness during Grain Boundary Migration in Ni Polycrystals
Thermo-kinetic Analysis of Zinc Aluminate Nanoparticles Coarsening
Which Interfaces Matter Most? Variability in Grain Boundary Defect Chemistry and Conductivity in a Concentrated Solid Electrolyte

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