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Meeting MS&T23: Materials Science & Technology
Symposium Phase Transformations in Ceramics: Science and Applications
Presentation Title Elevated Temperature Phase Control of Two-dimensional Mo2TiC2Tx Carbide Through Defect Engineering
Author(s) Brian Wyatt, Matthew Boebinger, Paul Kent, Zachary Hood, Shiba Adhikari, Srinivasa Kartik Nemani, Murali Muraleedharan, Annabelle Bedford, Wyatt Highland, Babak Anasori
On-Site Speaker (Planned) Brian Wyatt
Abstract Scope As a chemically diverse 2D transition metal carbide family, MXenes own many different atomic arrangements, such as ordered double transition metal (DTM) MXenes, where two transition metals occupy separate atomic layers interleaved by carbon. In this presentation, we demonstrate the phase behavior of an ordered DTM Mo2TiC2Tx MXene up to 2,000 C in an inert environment and investigate the role of adsorbed alkali metal cations (Na+, K+) on controlling Mo2TiC2Tx’s phase behavior. We study this using in-situ two-dimensional x-ray diffraction (XRD2) and scanning transmission electron microscopy (STEM). The combination of in situ XRD2 and STEM methods with density functional theory, ex situ XRD2, x-ray photoelectron spectroscopy, and thermogravimetric analysis demonstrate the effect of alkali metal cations on controlling the phase stability and transformation of Mo2TiC2Tx MXenes. This presentation further establishes the tools for ceramic scientists to develop MXenes as a diverse and tunable family of nanoceramics for ultra-high temperature applications.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

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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