About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Phase Transformations in Ceramics: Science and Applications
|
| Presentation Title |
Non-Equilibrium Phase Transformations in Swift Heavy Ion Irradiated Rare-Earth Sesquioxides |
| Author(s) |
Pradyumna Parshi, John Hirtz, William Jackson Reed, Cale Overstreet, Kenneth Sanders, Cameron L. Tracy, Changyong Park, Maik Lang |
| On-Site Speaker (Planned) |
Pradyumna Parshi |
| Abstract Scope |
Rare-earth sesquioxides (RE2O3) display complex polymorphic behavior, exhibiting several stable and metastable phases accessible over a range of compositions, temperatures, and pressures. Here, we investigate the structural modifications induced by irradiation of these materials with energetic ion beams, characterizing these phase responses using synchrotron X-ray diffraction and Raman spectroscopy. After irradiation with 946 MeV Au ions up to a fluence of 4 x 1013 ions/cm2, cubic C-type Dy2O3, Ho2O3 and Er2O3 transform to a monoclinic B-type phase, with Er2O3 additionally adopting a cubic X-type phase at intermediate fluences. Tm2O3 undergoes a C-to-B+X transformation, and Lu2O3 transforms from C-type to a complete X-type phase. Considering the potentially superionic properties of the X-type sesquioxides, which couple an ordered cation sublattice with a highly disordered anion sublattice, this study positions swift heavy ion irradiation as a unique tool to stabilize non-equilibrium phases with interesting material properties. |