熔融ケイ酸鉛の電気化学的研究 (第2報)

分解電圧, 起電力および逆起電力

抄録

The decomposition voltage of molten lead silicate was measured using Pt anode and molten Pb as cathode at 800°C, 850°C, and 900°C. On the curves showing the relationship between decomposition voltage and compositions of silicate, small discontinuities were observed at th compositions corresponding to 2PbO·SiO₂ and PbO·SiO₂. The electromotive force of the cell (-) Pb/PbO (in silicate)/O₂C (+) was also stndied. There was general decrease of E. M. F. with increasing temperature and concentration of PbO. The activity of PbO in the PbO-SiO₂ melts obtained from decomposition voltage and E.M.F. measurments was compared with values from Richardson's experiments. Furthermore, the X-ray analysis of PbO-SiO₂ glass as well as crystal, which was considered to be better approach to understand the constitution of molten lead silicate, has been carried out. The results indicate that there are three sets of similarity on the patterns changing at the neighborhood of each composition.