RADIATION AND CHEMICAL DURABILITY OF THE Cm-DOPED WASTE FORMS WITH GARNET STRUCTURE
作者： Sergey Yudintsev , Sergey Stefanovsky , Rodney Ewing , Sergey Tomilin , Andrey Lizin
DOI:
关键词: Mineralogy 、 Metamictization 、 Pyrochlore 、 X-ray crystallography 、 Irradiation 、 Amorphous solid 、 Analytical chemistry 、 Lattice constant 、 Materials science 、 Alpha decay 、 Doping
摘要: Available in abstract form only. Full text of publication follows: Complex iron-based oxides with garnet-type structure are proposed as promising forms for actinide waste immobilization. To confirm this suggestion, properties Cm-loaded garnets formulae Ca{sub 1.5}Gd{sub 0.908}Cm{sub 0.092}Th{sub 0.5}ZrFe{sub 4}O{sub 12} were examined. Accelerated radiation damage the samples was induced by doping {sup 244}Cm. Irradiation results disordering and complete amorphization one year since fabrication. The garnet lattice rendered to amorphous state at a dose 1.6 x 10{sup 18} {alpha}-decays/g or 0.17 displacements per atom (dpa). This value is good agreement earlier similar phases obtained under ion beam irradiation. Normalized Cm leach rate (MCC-1, 14 days) from after increased 1.4 -3} 5.8 g/(m{sup 2} d) 4 times. Structure recovered metamict heat-treatment. strongest reflections on XRD pattern heat-treated sample due parameter 0 = 12.641 {+-} 0.002 Angstrom. close unit cell dimension (12.652 Angstrom) before radiation-induced disordering. Weak frommore » minor ThO{sub Fe{sub 2}O{sub 3} occur. Radiation chemical durability these garnet-based other materials composed titanates (pyrochlore, perovskite). (authors)« less
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