The structure and properties of Nd3+-doped fluoro-sulfo-phosphate glasses under different melt conditions

Optical properties of Er3+ and Yb3+/Er3+‐doped NaF‐Na2SO4‐Al(PO3)3 fluoro‐sulfo‐phosphate glasses

“…The evaporation of fluoride and sulfate is our main concern and F is slightly over‐represented in SEM‐EDS. As can be seen from the result, the fluoride and sulfate losses in Al‐NaFPS are significantly lower than other FPS glasses reported before due to low‐melting temperature and also dependent on the initial contents 11‐13,19,20 …”

“…The experimental GFR of NaF‐Na 2 SO 4 ‐Al(PO 3 ) 3 (Al‐NaFPS) glasses melted in corundum and platinum crucibles enclosed within red solid and blue dash lines, respectively, are shown in Figure 1. Generally, GFRs of glass is dependent on crucibles and in Al‐NaFPS glass, the GFR was more affected by crucibles than Al‐BaFPS glass we reported before 13 . Two reasons should be considered: first, the corundum crucibles are mainly eroded by fluoride and sulfate, and the melting temperature of Al‐NaFPS (750°C‐1050°C) is lower than Al‐BaFPS (1250°C‐1350°C) glasses.…”

“…The Na‐AlFP, Ba‐AlFP, 13 and NAPF‐3 19−20 glasses in Table 1 were melted under different temperatures but same other conditions, which shows the loss of F (tested by SEM‐EDS) is related to the melting temperature. Other factors that influences F loss are ingredients quality, crucibles, the employ of F‐agent and initial F content in glasses which have been discussed thoroughly in 19.…”

“…Two reasons should be considered: first, the corundum crucibles are mainly eroded by fluoride and sulfate, and the melting temperature of Al‐NaFPS (750°C‐1050°C) is lower than Al‐BaFPS (1250°C‐1350°C) glasses. More retained fluoride and sulfate content could lead to greater corrosion of crucible and thus, introducing more Al which influences glass forming 13 . Second, cation Na has a smaller field strength compared with Ba, leading to greater erosion ability 4,14 .…”

“…First, the unfavorable melt conditions such as high melting temperature and traditional corundum crucible without lids cause high evaporation of fluoride and sulfate and further introduction of Al, respectively. In our previous study, the employ of the platinum crucible and as low as melting temperature have been proved to be productive in FPS glass preparation 13 . Second, the studies on FPS glass formation, structure, physical, and spectroscopic properties as well as the relationship among them are still insufficient.…”