Refinement of the α-U4O9 Crystalline Structure: New Insight into the U4O9 → U3O8 Transformation

被引：53
作者：
Desgranges, L. [1 ]
Badinozzi, G. [2 ,3 ]
Simeone, D. [2 ,3 ]
Fischer, H. E. [4 ]
机构：
[1] CEA DEN DEC, F-13108 St Paul Les Durance, France
[2] Ecole Cent Paris, SPMS, CNRS, F-92295 Chatenay Malabry, France
[3] CEA DEN DANS DMN SRMA LA2M, F-91191 Gif Sur Yvette, France
[4] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
来源：
INORGANIC CHEMISTRY | 2011年 / 50卷 / 13期
关键词：
NONSTOICHIOMETRIC URANIUM-DIOXIDE; NEUTRON-DIFFRACTION; UO2;
D O I：
10.1021/ic200316b
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
The oxidation reaction of UO2 into U3O8 is studied as a function of the crystalline distortion of interstitial oxygen clusters, named cuboctahedra, which appear in U4O9 and U3O7 intermediate phases. For that purpose, the refinement of alpha-U4O9 was performed because this phase undergoes a trigonal distortion from cubic beta-U4O9 when the temperature is decreased. In alpha-U4O9, the cuboctahedra can be described as crumpled sheets taken from a fragment of U3O8. The manner by which the accumulation of crumpled sheets can lead to the formation of U3O8 is discussed.
引用
收藏
页码：6146 / 6151
页数：6
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