含Fe₂O₃珪酸塩ガラスの赤外線吸収スペクトル

抄録

Infrared absorption spectra of silicate glasses containing Fe₂O₃ have been measured in order to find out the effect of Fe₂O₃ on the structure of silicate anion. In binary systems RO·Fe₂O₃ and R₂O·Fe₂O₃, the peak shifts of absorption spectra Fe³⁺-O²⁻ were studied in terms of the oxygen coordination number of Fe³⁺.
The results indicate that the wave numbers of absorption peaks in Fe³⁺(oct.)-O²⁻ and Fe³⁺ (tetr.)-O²⁻ were about 580 cm⁻¹ and 625∼660 cm⁻¹, respectively. The oxygen coordination number of Fe³⁺ varied with the (RO, R₂O)/Fe₂O₃ ratio and the basicity of RO, R₂O·Fe³⁺ in octahedral sites was predominant for the acidic glasses. It was assumed that the oxygen coordination number of Fe³⁺ in silicate glasses varied with the basicity of silicate glasses, and Fe³⁺ (oct.) acted on silicate anion structure as a network modifier.