About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
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Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
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| Presentation Title |
Experimental Assessment of the Influence of TiO2 Grain Size on Grain Boundary Energy Values Derived using the Mullins Analysis |
| Author(s) |
Koen J. H. Verrijt, Jeffrey M. Rickman, Helen M. Chan |
| On-Site Speaker (Planned) |
Koen J. H. Verrijt |
| Abstract Scope |
Grain boundary energies play an important role in processes such as grain growth and nucleation. These energies are commonly evaluated from dihedral angle (Ψ) measurements of groove profiles that develop during thermal etching. Values of Ψ are typically derived based on the well-known Mullins analysis* for a single isolated boundary. However, the effect of interacting grooves, which can occur at fine grain size and/or long grooving times, is not well established. This work addresses this question by using atomic force microscopy to track the apparent change in dihedral angle distribution of polycrystalline TiO2 as a function of grooving time. The potential for applying appropriate correction factors for different grain size/grooving conditions will be discussed. Furthermore, the effect of orientation difference on CoTiO3-TiO2 diphase boundary energy values was determined from samples with a CoTiO3 single crystal embedded in polycrystalline TiO2. *Mullins WW. Theory of thermal grooving. J Appl Phys. 1957;28(3):333-39. |