Investigation of uranium L-edges of metamict and annealed betafite
Conference
·
· Mater. Res. Soc. Symp. Proc.; (United States)
OSTI ID:5335115
The uranium site in naturally occurring metamict minerals of the pyrochlore group (A/sub 1-2/B/sub 2/O/sub 6/Y/sub 0-1/) has been investigated using x-ray absorption spectroscopy (XAS). Pyrochlore structures are common phases in proposed polycrystalline waste forms. Betafite, a member of the pyrochlore group (B = 2Ti greater than or equal to Nb+Ta), exhibits U-O bond lengths of 1.94 and 2.37 A for the metamict state, and 2.03 and 2.51 A for the crystalline (annealed) state. The U-O bond lengths decrease (approx. 0.1 A) and there is a disruption in the second nearest neighbor periodicidy as material is converted from the crystalline to the metamict state.
- Research Organization:
- Boeing Co., Seattle, WA
- DOE Contract Number:
- FG06-84ER45121
- OSTI ID:
- 5335115
- Report Number(s):
- CONF-850995-
- Conference Information:
- Journal Name: Mater. Res. Soc. Symp. Proc.; (United States) Journal Volume: 50
- Country of Publication:
- United States
- Language:
- English
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