Intergrowth structures in synthetic pyrochlores: Implications for radiation damage effects and waste form formulation
Titanate-based ceramic waste forms are currently under development for the immobilization of excess weapons plutonium. Both Hf and Gd are added to the ceramic formulation as neutron absorbers in order to satisfy a defense-in-depth concept for the waste form. The introduction of significant amounts of hafnium may be responsible for the presence of zirconolite-2M crystals in pyrochlore-based ceramics and the formation of zirconolite lamellae within pyrochlore. The zirconolite grows epitaxially on {l{underscore}brace}111{r{underscore}brace} planes of pyrochlore. Although the zirconolite lamellae within pyrochlore are non-cubic, any volume expansion due to radiation damage in the pyrochlore should still be isotropic; in addition, the presence of these intergrowths may allow some stress relief in the ceramic.
- Research Organization:
- Argonne National Lab., IL (US)
- Sponsoring Organization:
- US Department of Energy
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 20015736
- Country of Publication:
- United States
- Language:
- English
Similar Records
Element Partitioning in a Pyrochlore-Based Ceramic Nuclear Waste Form
Intergrowth Structure in U- and Hf-Bearing Pyrochlore and Zirconolite: TEM Investigation