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- W2023018574 abstract "To determine the water diffusion at the early stage of the alteration, X-ray and neutron reflectometry have been performed on altered simplified glasses and the SON68 glass (an inactive R7T7-type French nuclear glass). For the first experiment, the simplified and SON68 glasses were altered at pH 3 and pH 6 and characterized by X-ray reflectometry as a function of the alteration duration. The evolutions of the electron density profile obtained from the reflectivity curves simulations have allowed the determination of the layers compositions. At the beginning of the alteration and for pH 3, the altered surface layer is constituted of a dealkalized zone. Upon alteration progress, the water diffuses inside the layer and hydrolyzes the Si–O–B bonds. For the second experiment, glasses were altered in D2O (pD 3) and analyzed in D2O saturated cell. After a D2O/H2O substitution, the samples were characterized one more time in H2O saturated cell. The evolution of the scattering length density shows that in the first stage of the alteration, the layer is constituted of two parts: a dealkalized glass and a dealkalized and boron depleted glass where water has diffused. According to the glass composition and after few hours of alteration, this dealkalized glass part can disappear." @default.
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- W2023018574 date "2007-07-01" @default.
- W2023018574 modified "2023-09-25" @default.
- W2023018574 title "Water penetration mechanisms in nuclear glasses by X-ray and neutron reflectometry" @default.
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- W2023018574 doi "https://doi.org/10.1016/j.jnoncrysol.2007.03.002" @default.
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