Oxidation-reduction equilibria of iron and cerium in silicate glasses: Individual redox potentials and mutual interactions

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Abstract

The Fe(III)-Fe(II) and Ce(IV)-Ce(III) redox equilibria in CaMgAl-silicate glasses have been individually investigated as a function of base composition, melt temperature, imposed oxygen fugacity, and multivalent element concentration. The mutual interaction of these two redox couples has been studied in analogous glasses which simultaneously contained iron and cerium. The iron and cerium redox couples have been placed in a series of relative redox potentials for silicate glasses; in order of ease of reduction, Ce(IV)→Ce(III) > Fe(III)→Fe(II) > Cr(III)→Cr(II) > Eu(III)→Eu(II) >> Ti(IV)→Ti(III). In the glasses containing both iron and cerium, the Fe(II) ions are stoichiometrically oxidized by Ce(IV) ions to produce Fe(III) and Ce(III) ions, which form Ce(III)OFe(III) complexes. © 1980.

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Schreiber, H. D., Lauer, H. V., & Thanyasiri, T. (1980). Oxidation-reduction equilibria of iron and cerium in silicate glasses: Individual redox potentials and mutual interactions. Journal of Non-Crystalline Solids, 3839(PART 2), 785–790. https://doi.org/10.1016/0022-3093(80)90532-3

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