“…These properties make them interesting materials for applications in low-temperature sealing [1][2][3][4][5][6], vitrification of nuclear wastes [7,8], as well as laser host matrices after doping with rare-earth elements [9][10][11][12]. The low durability of phosphate glasses can be improved by the substitution of nitrogen for oxygen, which leads to a higher cross-linking density of the glass network [13,14].…”