著者

芦塚 正博 大谷 正康 Masahiro ASHIZUKA Masayasu OHTANI

出版者

東北大學選鉱製錬研究所

雑誌

東北大学選鉱製錬研究所彙報 (ISSN:0040876X)

巻号頁・発行日

vol.25, no.1, pp.53-65, 1969-10

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The resistance ΔR, which exists at the electrode-electrolyte interface and is dependent to the frequency used, is an important factor to be considered besides the resistance of the solution in the conductivity measurement of the electrolyte by alternating current. The present authors discussed in detail on the source of the resistance ΔR and its effect on the electrical conductivity. The results obtained are as follows : 1) Warburg's equation, Rs=a/√<ω>, Cs=b/√<ω>, is only available to the system, in which the slagmetal interface is at equilibrium potential and the exchange current density is large. Here, Rs, Cs, and W are the resistance, capacity and the frequency in radiance per second, respectively. 2) ΔR is not directly proportional to l/√<ω> and might be attributed to the surface roughness of the solid electrode. 3) The apparent activation energy of the conductivity is clearly affected by the frequency for melts with high conductivity such as Na_2O-SiO_2 melts.

著者

三本木 貢治 Koji SANBONGI

出版者

東北大學選鉱製錬研究所

雑誌

東北大学選鉱製錬研究所彙報 (ISSN:0040876X)

巻号頁・発行日

vol.8, no.1, pp.39-46, 1952-06

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The author had already performed some investigations on the reduction equilibrium of iron oxides and proposed the reduction equilibrium diagram of Fe-C-O system. But the equilibrium on systems of Fe_3O_4-liquid oxide-CO/CO_2 mixed gas and wustite-liquid oxide-CO/CO_2 mixed gas, and the relation between oxygen pct. in liquid oxide and CO/CO_2 mixed gas had not been measured. These relations were shown by concluded lines in the diagram. Recently these equilibrium were measured by Darken and Gurry and the relations between oxygen pct. in wustite and CO/CO_2 mixed gas were clecked from the view point of the statistical thermodynamics by Takeuchi and Igaki. Referring to these results, the author corrected the reduction equilibrium diagram of Fe-C-O system, then established the reduction equilibrium diagram of Fe-H-O system by the calculation.