ФТТ, 2008, том 50, выпуск 9: page 1623...

ФТТ, 2008, том 50, выпуск 9

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beta-irradiation effect in aluminoborosilicate glasses:
the role of RE-codoping (RE = Sm, Gd)

E.Malchukova, B.Boizot

CEA/DSM/DRECAM, Laboratoire des Solides Irradies, UMR 7642, CNRS $-$ CEA $-$ Ecole Polytechnique,
91128 Palaiseau, France

Sm-, Gd-codoping effect on the structural modifications of

beta-irradiated aluminoborosilicate glasses has been studied by electron paramagnetic resonance (EPR) and Raman spectroscopy. The EPR spectra showed that the relative amount of Gd

³⁺ ions occupying network former positions (Gd

_[n.f.]³⁺) follows a non-linear behaviour as a function of the Sm/Gd ratio. This suggests that codoping favors occupation by Gd

³⁺ ions of the network former rather than modifier positions in aluminoborosilicate glasses. We have observed the appearance of a superhyperfine structure of EPR lines attributed to boron oxygen hole centers (BOHC) with increasing Sm/Gd ratio. This suggests that Gd

³⁺ ions are diluted in the vicinity of the BOHC defects. The concentration of the defects created by irradiation reveals a non-linear dependence on Sm, Gd-codoping for the lowest irradiation dose (

10

⁵ Gy). Therefore, codoping also affects the defect creation processes at least at the lowest irradiation dose. Raman spectroscopy measurements suggest that the irradiation-induced structural changes depend in a non-linear way on the Sm/Gd ratio. In fact, the shift of the Si

-

-

Si bending vibration modes reveals a clear minimum for the samples containing equal amounts of Sm and Gd (1 : 1) in the investigated glasses.

PACS: 61.43.Fs, 76.30.-v, 78.30.Ly

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