Irradiation induced order-disorder phase transformation in A(4)Zr(3)O(12) (A = Sc, Lu and Dy)
Wang, Y. Q.
Valdez, J. A.
Sickafus, K. E.
- 能源院－会议论文 
In this study, 200 key Ne+ ion irradiations were performed under cryogenic conditions (similar to 77 K) on delta-phase oxide compounds with formula, A(4)Zr(3)O(12) (A = Sc, Lu and Dy). An order-to-disorder (O-D) phase transformation was observed in delta-Lu4Zr3O12 and delta-Sc4Zr3O12 after Ne+ ion irradiation, but no phase change was observed in Dy4Zr3O12. The latter compound exhibited a disordered fluorite structure before and after irradiation. The threshold doses to produce O-D phase transformations using Ne+ ions were found to be significantly lower than for similar irradiations (reported previously) using Kr++ ions. This suggests that light ions are more efficient than heavy ions in producing the retained defects that are ultimately responsible for the observed O-D transformation. The ion irradiation-induced O-D transformations observed here are discussed in terms of analogous transformations found in temperature-composition (T-C) phase diagrams for A(4)Zr(3)O(12) compounds. (C) 2011 Elsevier B.V. All rights reserved.