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Meeting MS&T23: Materials Science & Technology
Symposium Phase Transformations in Ceramics: Science and Applications
Presentation Title Phase Stability and Cation Partitioning in Multi-rare Earth Aluminates and Zirconates
Author(s) Yueh-Cheng Yu, David Poerschke
On-Site Speaker (Planned) David Poerschke
Abstract Scope Aluminate and zirconate materials containing multiple rare-earth (RE) cations are of interest for next-generation thermal and environmental barrier coatings (T/EBC) due to lower thermal conductivity and tunable chemical response to corrosive species. Many reports focus on the ability to entropically stabilize certain crystal structures (e.g., garnet, perovskite, fluorite) with a various RE cation combinations, without directly assessing changes in the intrinsic lattice stability. To address this need, this study investigated the stability of aluminates containing mixtures of Gd, La, Nd, Y, and Yb either constrained to a single phase based on stoichiometry, or as part of multi-phase assemblages. The results show that at although single phase, mixed-RE aluminates can be stabilized, there is often a strong tendency for selective RE cation partitioning based on RE-size trends in the constituent binary systems. These results provided valuable insight into the relative thermodynamic stability of multi-RE phases to guide next-generation T/EBC design.


Computational Study of Site-disordered AgSbI4
Crystal Structure Solution and Phase Transformations of CaZr4(PO4)6 and SrZr4(PO4)6
Effect of Cations Decoration on Ti3C2Tx MXene, its Stability and Phase Transformation at High Temperatures
Elevated Temperature Phase Control of Two-dimensional Mo2TiC2Tx Carbide Through Defect Engineering
Enhancing Oxidation Resistance of Silicon Nitride Using Ca2+ Stabilizer
Microstructural Evolution and Associated Kinetics of Seeded Solid State Single Crystal Growth of CoTi2O5
Phase Stability and Cation Partitioning in Multi-rare Earth Aluminates and Zirconates
Phase Transformations in Ceramic Materials under Extreme External Forcing
Progress on Phase Stability of Substituted Rare Earth Disilicate Compositions for Environmental Barrier Coatings
Spinodal Decomposition in Ferroelectric Crystals
Structural Evolution of MgAl2O4 and NiAl2O4 Disordered Spinel Oxides Studied via In Situ Neutron Total Scattering
Using Total Scattering Techniques to Explore Fundamental Aspects of the Structural Organization in Weberite-type Tantalate Oxides

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