Strictural properties of ferrous borosilicate glasses

The behavior of iron in the structure of sodium iron-containing borosilicate glasses with different ratios of network-forming cations and modifier cations was studied using the methods of M?ssbauer and vibrational spectroscopy. The difference in the distribution of modifier cations between different types of structural units in the structure of the initial and iron-containing sodium borosilicate glasses was established. With the addition of iron, the proportion of BO4 tetrahedra decreases and the BO3 triangles and the proportion of structural units Q ² and Q ³ increase, containing nonbridging oxygen atoms. This is accompanied by the destruction of mixed silicon borate rings and the formation of Si-O-Fe ³⁺ bridging bonds and Si-O- nonbridging bonds coordinated by Fe ²⁺ ions.