# $^4$He channelling studies of $U_4O_9$

Abstract : UO2 and U4O9 single crystals were investigated by means of the 4He backscattering/channelling technique and the use of the 3032-keV elastic scattering resonance on 16O. Angular scans obtained for U4O9 were interpreted in the framework of a recently published U4O9 model. It was shown that the U4O9 channelling data can be explained by the aggregation of some O atoms in cuboctahedral clusters, and the displacement of other (U and O) atoms from the UO2-type sites. Basing on the combined use of the channelling technique and Monte Carlo simulations we suggest that the displacements of U atoms from their fluorite sites are larger than those determined by the neutron diffraction analysis.
Keywords :
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00090037
Contributor : Dominique Girod <>
Submitted on : Sunday, August 27, 2006 - 9:13:22 AM
Last modification on : Wednesday, September 16, 2020 - 4:17:45 PM

### Citation

F. Garrido, L. Nowicki, A. Stonert, A. Pietraszko, E. Wendler. $^4$He channelling studies of $U_4O_9$. Seventeenth International Conference on Ion Beam Analysis, Jun 2005, Seville, Spain. pp.497-500, ⟨10.1016/j.nimb.2006.03.039⟩. ⟨in2p3-00090037⟩

Record views