B
2
O
3
[wt.%]
Na
2
O
[wt.%]
Fe
2
O
3
[wt.%]
BNF1
95
5
0
BNF2
85
10
5
BNF3
75
15
10
BNF4
65
20
15
BNF5
55
25
20
Table 1:
Chemical compositions of studied glasses (BNF).
