Neutron diffraction studies of U4O9:: Comparison with EXAFS results

被引：34
作者：
Garrido, F.
Hannon, A. C.
Ibberson, R. M.
Nowicki, L.
Willis, B. T. M.
机构：
[1] Univ Oxford, Chem Res Lab, Oxford OX1 3TA, England
[2] Univ Paris 11, CNRS, IN2P3, Ctr Spectrometrie Nucl & Spectrometrie Masse, F-91405 Orsay, France
[3] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England
[4] Andrzej Soltan Inst Nucl Studies, PL-00681 Warsaw, Poland
来源：
INORGANIC CHEMISTRY | 2006年 / 45卷 / 20期
关键词：
D O I：
10.1021/ic060964c
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
Conradson et al.(1) have analyzed X-ray absorption fine-structure spectra of the UO2-U4O9 system and concluded that oxygen atoms are incorporated in U4O9 as oxo groups with U-O distances in the range 1.72-1.76 angstrom. They also found that the uranium sublattice consists of an ordered portion and an additional 'spectroscopically silent' glassy portion. We have carried out studies of powdered U4O9 by neutron diffraction which contradict these conclusions from EXAFS measurements. Our analysis shows that there are no U-O bonds shorter than 2.2 angstrom and that U4O9 is crystallographically ordered with no evidence of a glassy structure.
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页码：8408 / 8413
页数：6
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