Abstract
The structural variations from alpha decay in borosilicate glasses attract much attention. The glass samples were irradiated with single and sequential beams in Xe20+ and He+ ions. Sequential irradiation means the glasses, which were pre-irradiated with Xe20+ ions, were irradiated with He+ions. The variations in macroscopic properties and microstructure were analyzed by nanoindentation, Raman spectra, infrared spectra and XPS spectra, respectively. After He+ ion irradiation, the hardness of glasses decreases, and the BO4 units increase in the glasses, attributed to the migration of Na on the sample surface. The hardness recovery was observed in sequential irradiation. Combined with the results of single ion irradiation, a reason for hardness recovery is that the migration of Na in deep layer causes the BO3 structure to transform into BO4 structure after He+ions irradiation. The variation of boron structures in sequential irradiation could be considered as the superposition of two single irradiation effects.
Published Version
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