含Fe<SUB>2</SUB>O<SUB>3</SUB>珪酸塩ガラスの赤外線吸収スペクトル

Abstract

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.