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Oxidation‐reduction equilibria of ferrous/ferric ions in oxide melts
Author(s) -
Ohashi Seiji,
Kashimura Masumi,
Uchida Yuichi,
McLean Alexander,
Iwase Masanori
Publication year - 2000
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.200001332
Subject(s) - ferrous , ferric , ferric ion , oxide , ion , reduction (mathematics) , chemistry , ferric iron , inorganic chemistry , oxidation reduction , redox , metallurgy , materials science , organic chemistry , mathematics , biochemistry , geometry
Oxidation‐reduction equilibrium experiments were conducted with oxide melts containing CaO, Li 2 O, Al 2 O 3 , ZnO, B 2 O 3 , SiO 2 and small concentrations of iron oxide. The results indicated that for compositions within the acidic regime, the ratio {(Fe 3+ )/(Fe 2+ ) P O2 1/4 } decreased with an increase in basicity while for relatively basic melts, the ratio increased with an increase in basicity. This variation of {(Fe 3+ )/(Fe 2+ ) P O2 1/4 } could be interpreted in terms of the optical basicity of the glass melts and is consistent with the following expressions for the red‐ox equilibria within acidic and relatively basic melts, respectively: In an acidic melt, the temperature dependence of the reaction yielded an enthalpy value which was in excellent agreement with the enthalpy change for the reaction: For a relatively basic melt, the enthalpy value for the corresponding reaction was about half of that found for the acidic melt.