| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
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| Presentation Title |
Influence of Initial Duplex Microstructure on Solid-State Pseudo-Single Crystal Growth of CoTi2O5 |
| Author(s) |
Junyan Zhang, Connor McNamara, Jeffrey Rickman, Helen Chan |
| On-Site Speaker (Planned) |
Junyan Zhang |
| Abstract Scope |
Cobalt dititanate (CoTi2O5) belongs to a special class of ceramics that is entropy-stabilized, and hence is only thermodynamically stable at temperatures above 1140 oC. Starting with a CoTiO3-TiO2 two-phase structure, heat-treatment at temperatures greater than Tc results in solid state reaction to pseudo-single crystal CoTi2O5. The CoTi2O5 morphology and degree of transformation via seeded growth were studied as a function of time for isothermal heat-treatment at temperatures from 1175 – 1300 oC. Experimental techniques employed include EBSD (electron backscatter diffraction) and XRD (x-ray diffraction). TEM (transmission electron microscopy) was used to study the CoTiO3-TiO2 biphasic boundary structure to elucidate any changes ahead of the formation of the CoTi2O5. The focus of this talk will be the influence of initial duplex grain size on both the transformation kinetics and microstructural evolution of CoTi2O5. The experimental data will be discussed with reference to the results of simulations from a stochastic reaction-diffusion model. |