Nature of mechanically induced defects in polycrystalline hydrargillite and Al2O3-A1(OH)3 studied by radiation methods

Radiolytic Events in Nanostructured Aluminum Hydroxides

“…The spin parameters of RID I and RID I′ are in the range found for oxygen centers O – in Al 2 O 3 and Al­(OH) 3 . ,, O – corresponds to a hole trapped in filled 2p orbitals of oxygen; it has a spin 1/2 and an axial anisotropy with g x = g y > g z ≈ g e . We checked also that similar centers were formed in Al 2 O 3 nanoparticles formed by dehydration of the various materials.…”

“…Steinike et al reported the formation of ozonide in mechanical-treated Hydrargillite, a polymorph of the Gibbsite. 6 Despite the poor quality of the figures reported in the literature, some similarities can be found between RID II signal and the signal reported by Steinike et (2)…”

“…The concentration of the H radical remains unchanged when the sample was exposed to air. This result leads us to suppose that most reactions are not happening on the surface and that 6,25,26 O − corresponds to a hole trapped in filled 2p orbitals of oxygen; it has a spin 1/2 and an axial anisotropy with g x = g y > g z ≈ g e . 27 We checked also that similar centers were formed in Al 2 O 3 nanoparticles formed by dehydration of the various materials.…”

“…and the related mechanisms are not well-defined. 6,7 So far, limited data exists on the behavior of hydroxides under irradiation in general and of the prototypal AlOOH and Al(OH) 3 in particular. 8−10 AlOOH (Boehmite) and Al(OH) 3 (Bayerite) formed as corrosion products on fuel cladding, were selected to serve as model compounds for other hydroxides and oxyhydroxide encountered in the storage and disposal of nuclear wastes.…”

“…Though, their diffusion to the surface depends on mechanical treatments, structure, particle size, etc. and the related mechanisms are not well-defined. , …”