About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Phase Transformations in Ceramics: Science and Applications
|
| Presentation Title |
Characterizing Rare Earth Sesquioxide Phase Transformations Induced by High-Energy Ball Milling |
| Author(s) |
William Jackson Reed, Eric O'Quinn, Antonio Fuentes, Nenad Velisavljevic, David Sprouster, Maik Lang |
| On-Site Speaker (Planned) |
William Jackson Reed |
| Abstract Scope |
The energy transfer during mechanical action via high-energy ball milling creates far-from-equilibrium conditions characterized by extreme temperature and pressure transients. These conditions induce phase transformations in rare earth (RE) sesquioxides (RE2O3) from a cubic (C-type) to a monoclinic (B-type) phase. For lanthanides Gd-Lu, the rate of these phase transformations and the total B-type saturation fraction increase with cation size and milling speed. The structural response of Y2O3 does not follow the B-type phase transformation rate and saturation trend with cation size, which is comparable to Ho2O3, suggesting that electronic structure plays a role in the C-to-B transformation induced by milling. Variation in the milling ball size (diameter: 5, 10, 15 mm) during milling of Gd-, Ho-, and Er2O3 shows that the energy dose rate correlates with the saturation level of the accessible B-type phase fraction. |