Effet des traitements thermiques et de l'irradiation par les neutrons sur les proprietes physiques et mecaniques de l'oxyde de beryllium fritte sous charge

Elston, J.; Labbé, Christian

doi:10.1016/0022-3115(61)90124-6

Cited by 24 publications

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“…However, in a few X-ray diffraction studies of BeO irradiated to fast neutron doses (En> 1 Mev) of 1019 to 102° nvt, only anisotropic expansions of the hexagonal unit cell (Aa3/a3 ~4-7 × LJal/al) have been observed (Bacon & Wilson, 1955;Elston & Caillat, 1958;Clarke et al, 1961). Changes in reflection profiles after irradiation have been noted by Elston & Labbe (1961), but an interpretation of the effect was not given. The anisotropic lattice expansions usually have been attributed to random isolated point defects generated by the fast neutron flux.…”

Section: Introductionmentioning

confidence: 99%

Structural changes in irradiated BeO

Yakel¹,

Borie²

1963

Acta Cryst

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X-ray diffraction studies of polycrystalline beryllium oxide irradiated to 1.5 x 1021 nvt (En > 1 Mev) at 110 °C have shown selective symmetric or asymmetric broadening of reflections Me.1 with 1 not zero. Displacements of reflection maxima and centroids occur in such a manner that a unique a a lattice parameter cannot be defined from spacing measurements. Models of clustered interstitial and vacancy defects in a damaged BeO lattice have been proposed and the X-ray scattering from these models has been calculated. Comparison of theoretical and experimental results indicates that the best agreement is obtained for an interstitial cluster model. Some physical implications of this model are discussed.

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Section: Introductionmentioning

confidence: 99%