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Meeting MS&T23: Materials Science & Technology
Symposium Phase Transformations in Ceramics: Science and Applications
Presentation Title Microstructural Evolution and Associated Kinetics of Seeded Solid State Single Crystal Growth of CoTi2O5
Author(s) Junyan Zhang, Connor McNamara, Kevin P. Anderson, Animesh Kundu, Helen M. Chan, Jeffrey M. Rickman
On-Site Speaker (Planned) Junyan Zhang
Abstract Scope A duplex grain structure of CoTiO3 and TiO2 can react to form pseudo-single crystal CoTi2O5 during heat-treatment. CoTi2O5 is an entropy stabilized compound which is only stable above a critical temperature. For a sample seeded with an upper layer of polycrystalline CoTi2O5, CoTi2O5 nucleates at the seeded surface and grows inwards with a planar reaction front. The reaction initiates along the bi-phase boundaries and continues via bulk diffusion behind the reaction front. The CoTi2O5 morphology and degree of transformation was studied as a function of time for isothermal heat-treatment at temperatures from 1175 – 1300 oC. EBSD (electron backscattered diffraction) was used to characterize the preferred growth direction and the variation of orientation within the CoTi2O5. The kinetics of this complex and unusual transformation were studied using both dilatometry and microstructural observations. The results will be discussed in terms of the rate-determining transport mechanisms at and behind the reaction front.


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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