Intergrowth structures in synthetic pyrochlores [electronic resource] : implications for radiation damage effects and waste form formulation.
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| Online Access: |
Online Access |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Department of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
1999.
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| Abstract: | 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_brace}111{r_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. |
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| Item Description: | Published through SciTech Connect. 03/30/1999. "anl/cmt/cp-96770" MRS 1998 Fall Meeting, Boston, MA (US), 11/30/1998--12/04/1998. Buck, E. |
| Physical Description: | 11 pages : digital, PDF file. |