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Structural Origin of the Optical Properties of Ag-Doped Fluorophosphate and Sulfophosphate Glasses

“…It is interesting to think about what these pairs of peaks mean structurally; we have found no evidence in the literature of SO 4 2– interacting with the phosphate backbone in sodium-containing sulfophosphate glasses, and only in H-, Li-, or Ag-containing sulfophosphate glasses has indirect evidence of this being observed through electrical conductivity, Raman, or 31 P NMR spectroscopy. ,− Although our NaPS-Ag spectra (Figure b) look very similar to Scotti et al .’s x Ag 2 SO 4 /(1 – x )­AgPO 3 31 P NMR spectra, the authors only discuss “middle” phosphates (MP) and “end” phosphates (EP), Q 2 and Q, without the possibility of the existence of orthophosphate, Q 0 . Instead, they assign the intensity in the Q 0 region (10–0 ppm) to Q 1 units with various S–O–P bonding.…”

Formation and structure of ionic (Na, Zn) sulfophosphate glasses

“…To our best knowledge, sulfophosphate glasses in the present sense have first been described by Arkhipov, Mamoshin et al in the early 1980s [15][16][17][18][19][20][21]. At that time, the material appears to have been studied primarily with respect to vitrification of sulfate-rich ashes.…”

“…Whereas during the discovery of sulfophosphate glasses, initially, sulfate solubility appears to have been the major subject of interest, already shortly after Mamoshin et al's first reports, low T g and softening temperature became primary targets. In this context, glass formation has now been studied in, e.g., Na 2 SO 4 -ZnSO 4 -NaPO 3 [15] , Na 2 O-SiO 2 (P 2 O 5 )-SO 3 [17], [18], ZnSO 4 -KPO 3 -NaPO 3 , Li 2 SO 4 -Na 2 SO 4 -K 2 SO 4 [16], xS:(1-x)AgPO 3 [30], Na 2 SO 4 -P 2 O 5 -H 2 O [19], SrSO 4 -KPO 3 -Na 2 B 4 O 7 [20] and Li 2 O-Li 2 SO 4 -P 2 O 5 [31,32]. In various cases, it has been shown that homogeneous glasses with T g b 330°C can be prepared at melting temperatures of b800°C without the necessity of specifically high cooling rates [11].…”

Role of Ag+ Ions in Determining Ce3+ Optical Properties in Fluorophosphate and Sulfophosphate Glasses

“…Aside from cation solubility, phosphate glasses also enable the facile incorporation of secondary anionic species such as sulfate, fluoride, chloride, and nitride ions at high (tens of mol %) concentrations. , The addition of such secondary anionic species has pronounced and sometimes unexpected effects on the structure and properties of the phosphate backbone material . For example, it has been found that the glass-forming ability and corrosion resistance of phosphate glasses can be enhanced significantly through the introduction of sulfate anions (SO 4 2– ), − even though the glass structure was increasingly depolymerized when replacing P 2 O 5 by SO 3 . Similar relationships between glass structure and variations in anion content are of interest for understanding the properties of optically active ions doped into such materials, whereby the variation of anion species offers a range of new ligand configurations as compared to that of conventional phosphate glasses. ,− Furthermore, anion exchange may reduce the phonon energy such as in the prominent fluoride-phosphate (FP) glasses , and may also enhance the transmission window toward the deep blue or ultraviolet (UV) spectral range. ,− …”