Structure and corrosion mechanism of iron phosphate glass with strontium from electrochemical reprocessing

Formation Mechanism of Crystalline Phase during Corrosion of Aluminum Phosphate Glasses

“…The chemical shifts and peak characteristics of the narrow peaks presented in the 31 P MAS spectra of the corroded glasses closely resemble the 31 P signals observed in the sediments. To identify the phosphorus units of the corroded glasses and help to deconvolute the spectra, 31 P 1D refocused INADEQUATE and 31 P{ 27 Al} REAPODR experiments were conducted on the corroded glass C-7d, as shown in Figure S6A,B along with explanatory statements provided below the figures. The phosphorus units detected within the crystal layer of the corroded glass predominantly consist of Q 1 2Al units, similar to the P units observed in the sediment.…”

“…Their 31 P signals exhibit significant differences compared to the pristine glass (Figure 1A, top), featuring a distinct narrow peak near −9.5 ppm within a broader spectrum. The chemical shifts and peak characteristics of the narrow peaks presented in the 31 P MAS spectra of the corroded glasses closely resemble the 31 P signals observed in the sediments. To identify the phosphorus units of the corroded glasses and help to deconvolute the spectra, 31 P 1D refocused INADEQUATE and 31 P{ 27 Al} REAPODR experiments were conducted on the corroded glass C-7d, as shown in Figure S6A,B along with explanatory statements provided below the figures.…”

“…The leachates from the 2-and 7day immersion periods are clear and transparent. To investigate the differences between these leachates, liquid 31 P and 27 Al single-pulse experiments were conducted on them. The 31 P single-pulse spectra (Figure 5A) of the leachates exhibit multiple peaks in two regions: approximately 1.8 ppm and −6.0 to −12.0 ppm, which can be assigned to Q 0 and Q 1 units, respectively, based on their chemical shifts.…”

“…All NMR experiments were conducted on a Bruker Avance III HD 500 MHz spectrometer with an 11.7 T magnetic field at room temperature. These experiments include 27 Al single pulse, 31 P single pulse, 27 Al{ 31 P} REDOR, 27 Al{ 1 H} REDOR, 31 P{ 27 Al} REAPDOR, 31 P 1D refocused INADEQUATE, 31 P 2D J-resolved, 27 Al{ 27 Al} WURST 2Q− Raman spectra were acquired on a Renishaw inVia Raman microscope employing a 488 nm wavelength laser for excitation. XRD analysis was performed using an ARL X'TRA diffractometer with Cu Kα radiation (λ = 0.154 nm).…”

“…Previous research on glass corrosion has predominantly been centered around borosilicate and silicate glasses. In contrast, the exploration for phosphate glasses has been rarely studied, despite their substantial application in diverse fields such as optical materials, bioactive glasses, and the encapsulation of nuclear waste. ,,− Crystal products have also been observed in certain corroded phosphate glasses. − However, there remains a paucity of research concerning the corrosion mechanism of phosphate glasses, and an in-depth understanding of the formation of crystalline phases is still lacking.…”