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Hydrogen reduction of Cu-Mn-Fe-O spinel solid solutions

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Inorganic Materials Aims and scope

Abstract

The crystal-chemical transformations accompanying the hydrogen reduction of CuxMn1 - xFe2O4 (x = 0.2, 0.5, 0.8) solid solutions are investigated, and general equations describing these processes over the entire composition range (0 ≤ x ≤ 1) are derived. The results on the character of the processes involved differ radically from earlier findings. The equilibrium oxygen pressure is evaluated for the low-oxygen phase boundary of the spinel solid solutions throughout their stability region. For \(\left( {MnFe_2 O_4 } \right)_{x_1 } \left( {Cu_{0.5} Fe_{2.5} O_4 } \right)_{1 - x_1 - x_2 } \) solid solutions, which are of practical interest, the \(\log p_{O_2 } \left( {{1 \mathord{\left/ {\vphantom {1 T}} \right. \kern-\nulldelimiterspace} T}} \right)\) data are well represented by the equation \(\log \left( {{{p_{O_2 } } \mathord{\left/ {\vphantom {{p_{O_2 } } {Pa}}} \right. \kern-\nulldelimiterspace} {Pa}}} \right) \pm 0.4 = 12.8 - 3.7x_1 - 2.8x_2 - {{10280} \mathord{\left/ {\vphantom {{10280} {T,}}} \right. \kern-\nulldelimiterspace} {T,}}\), which is of importance in controlled synthesis of single-phase materials in this system.

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  1. Kirovograd National Technical University, Universitetskii pr. 8, 25006, Kirovograd, Ukraine

    E. V. Zinovik & M. A. Zinovik

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  1. E. V. Zinovik
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  2. M. A. Zinovik
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Translated from Neorganicheskie Materialy, Vol. 41, No. 3, 2005, pp. 332–338.

Original Russian Text Copyright © 2005 by E. Zinovik, M. Zinovik.

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Zinovik, E.V., Zinovik, M.A. Hydrogen reduction of Cu-Mn-Fe-O spinel solid solutions. Inorg Mater 41, 272–278 (2005). https://doi.org/10.1007/s10789-005-0122-0

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  • DOI: https://doi.org/10.1007/s10789-005-0122-0

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