State of sulphur and Iron-Sulphur Interaction in Soda Silicate Glasses(Materials, Metallurgy, Weldability)

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State of sulphur and interaction between sulphur and iron ions in soda silicate glasses were investigated by optical absorption, electron spin resonance(ESR) and S K_α emission spectroscopies. An absorption was observed near 24000cm^<-1> in the optical absorption spectra of the glasses produced in the moderately (P_<o_2>=10^<-5・1>atm.) and strongly (P_<O^2>=10^<-6・7>atm.) reducing atmospheres. From ESR measurement, the increase of the absorption near g=6.0, which suggests the formation of Fe^<3+>-S^<2-> bond, was observed in the glasses with sulphur and iron which were produced in the strongly reducing atmosphere. Chemical shift study in S K_α emission X-ray spectra supported that sulphur in soda silicate glass was in the form of S^<6+> in oxidizing condition (in air) and in the mixed state of S^0 and S^<6+> in the strongly reducing condition. From these results, it was suggested that polysulphide ion such as S^-_2 ion was formed in soda silicate glass as intermediate stage. Further, it was indicated that iron ion group coordinated with sulphur such as Fe^<3+>O_5S, Fe^<3+>O_4S_2 or Fe^<3+>O_3S was formed in soda silicate glasses produced in the strongly reducing condition.
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