Recently, the Department of Advanced Laser and Optoelectronic Functional Materials of Shanghai Institutes for Optical Precision and Mechanical Research (SIPMR), Chinese Academy of Sciences (CAS), has made new progress in the corrosion mechanism of alkaline aluminum phosphate glass. The research results were published in The Journal of Physical Chemistry C under the title of "Formation Mechanism of Crystalline Phase during Corrosion of Aluminum Phosphate Glasses". Physical Chemistry C.
Aluminum phosphate glasses have important applications in nuclear waste glass curing. Among them, chemical stability is crucial for their applications. To gain a deeper understanding of the chemical stability of glass, it is inevitable to recognize its chemical corrosion mechanism. The study of glass corrosion mechanism has a history of many years, but there are still many controversies. Previous studies have mainly focused on borosilicate glass, while the corrosion mechanism of phosphate glass has been less studied.
In this study, by using a variety of advanced nuclear magnetic resonance techniques, the researchers carried out atomic-scale resolution of the structure of alkali aluminum phosphate glass before and after corrosion, and found that there are two different dissolution modes for the Q1 group and the Q0 group of the glass in aqueous solution. This confirms that the crystal layer on the surface of phosphate glass originates from the dissolution of glass components and their subsequent deposition on the glass surface. The mechanism of dissolution of alkali aluminum phosphate glasses in aqueous solution and the formation of crystal layers on the surface are revealed. The results deepen the understanding of the chemical stability mechanism of alkali aluminum phosphate glass.
(a) Two dissolution modes of glass. (b) 27Al｛27Al｝ 2D WURST 2Q-1Q spectrum of corroded glass.
