Neutron diffraction studies of U4O9: Comparison with EXAFS results

F. Garrido; A. C. Hannon; R. M. Ibberson; L. Nowicki; B. T.M. Willis

doi:10.1021/ic060964c

Neutron diffraction studies of U₄O₉: Comparison with EXAFS results

F. Garrido, A. C. Hannon, R. M. Ibberson, L. Nowicki, B. T.M. Willis

Research output: Contribution to journal › Article › peer-review

37 Scopus citations

Abstract

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 Å. 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 Å and that U₄O₉ is crystallographically ordered with no evidence of a glassy structure.

Original language	English
Pages (from-to)	8408-8413
Number of pages	6
Journal	Inorganic Chemistry
Volume	45
Issue number	20
DOIs	https://doi.org/10.1021/ic060964c
State	Published - Oct 2 2006
Externally published	Yes

Access to Document

10.1021/ic060964c

Cite this

@article{dc18128b996e42c08c9958cdcbb97a28,

title = "Neutron diffraction studies of U4O9: Comparison with EXAFS results",

abstract = "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 {\AA}. 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 {\AA} and that U4O9 is crystallographically ordered with no evidence of a glassy structure.",

author = "F. Garrido and Hannon, {A. C.} and Ibberson, {R. M.} and L. Nowicki and Willis, {B. T.M.}",

year = "2006",

month = oct,

day = "2",

doi = "10.1021/ic060964c",

language = "English",

volume = "45",

pages = "8408--8413",

journal = "Inorganic Chemistry",

issn = "0020-1669",

publisher = "American Chemical Society",

number = "20",

}

TY - JOUR

T1 - Neutron diffraction studies of U4O9

T2 - Comparison with EXAFS results

AU - Garrido, F.

AU - Hannon, A. C.

AU - Ibberson, R. M.

AU - Nowicki, L.

AU - Willis, B. T.M.

PY - 2006/10/2

Y1 - 2006/10/2

N2 - 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 Å. 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 Å and that U4O9 is crystallographically ordered with no evidence of a glassy structure.

AB - 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 Å. 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 Å and that U4O9 is crystallographically ordered with no evidence of a glassy structure.

UR - http://www.scopus.com/inward/record.url?scp=33750298314&partnerID=8YFLogxK

U2 - 10.1021/ic060964c

DO - 10.1021/ic060964c

M3 - Article

AN - SCOPUS:33750298314

SN - 0020-1669

VL - 45

SP - 8408

EP - 8413

JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 20

ER -

Neutron diffraction studies of U₄O₉: Comparison with EXAFS results

Abstract

Access to Document

Other files and links

Fingerprint

Cite this