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Meeting Materials Science & Technology 2019
Symposium Phase Transformations in Ceramics: Science and Applications
Presentation Title Pseudo-single Crystal Growth of Cobalt Dititanate, an Entropy Stabilized Compound
Author(s) Kevin P. Anderson, Anit Giri, Richard P. Vinci, Helen M. Chan
On-Site Speaker (Planned) Helen M. Chan
Abstract Scope Solid state reaction is a widely used synthesis technique for ceramics, but usually results in polycrystalline materials. In this work, pseudo-single crystal powders of the pseudobrookite compound CoTi<sub>2</sub>O<sub>5</sub> were synthesized by solid-state reaction in a duplex grain mixture of CoTiO<sub>3</sub> and TiO<sub>2</sub>. The transformation and subsequent microstructural evolution of the CoTi<sub>2</sub>O<sub>5</sub>was studied by scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), and X-ray diffraction (XRD). A novel growth mechanism was identified whereby a single crystal CoTi<sub>2</sub>O<sub>5</sub> front advances simultaneously along multiple CoTiO<sub>3</sub> /TiO<sub>2</sub> diphasic boundaries. The single crystal domains were composed of subgrains; differences in the subgrain size and misorientation were related to the growth mechanism and the initial grain size of the duplex CoTiO<sub>3</sub> - TiO<sub>2</sub> mixture. The conditions under which eutectoid decomposition of the CoTi<sub>2</sub>O<sub>5</sub> took place were also explored.
Proceedings Inclusion? Definite: At-meeting proceedings

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First-principles Investigation of Phonon Instabilities and Displacive Phase Transitions in CaTiO3-perovskites
First principles Investigation into the Phase Stability and Enhanced Hardness of TiN-ScN and TiN-YN Alloys
In-situ Observations of Phase Transformations on Individual Particles of a Cu/Fe Oxygen Carrier during High-temperature Oxidation and Reduction Cycles
In-situ Phase Diagram Determination of the HfO2-Ta2O5-TiO2 Ternary Up to 3000 ˚C
In-situ X-ray Characterization of Phase Evolution during Solid-state Synthesis of Multicomponent Systems
In Situ Investigation of Stress-Induced Martensitic Transformation in Granular Shape Memory Ceramics
Influence of Annealing Temperature and Time on Phase Stability and Fracture Toughness of Rare-earth Stabilized Zirconia
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Phase Transformations in High-entropy, Lanthanide Oxides
Phase Transitions in Hollandite Oxides with Nanoscale Chemical Ordering
Precipitation in Metal-Ceramic Systems Under Reducing Conditions
Prediction of Diffusionless Phase Transformation by Determination of the Orientation Relationship, Shear, and Motif Translation with the Smallest Atom Shuffles
Pseudo-single Crystal Growth of Cobalt Dititanate, an Entropy Stabilized Compound
Reactive Texturing of Yttria and Ceria TZP in a Strong Magnetic Field
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