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Electrochemical determination of thermodynamic properties and x-ray diffraction investigation of the Fe3O4-ZnFe2O4 system.

Authors
Schaefer-SC; McCune-RA
Source
Metall Trans B 1986 Sep; 17(3):515-521
NIOSHTIC No.
10005393
Abstract
The Bureau of Mines investigated the thermodynamic properties of the Fe3O4-ZnFe2O4 solid solutions. Activities of Fe3O4 (magnetite) in solid solutions were determined with high-temperature electromotive force (EMF) cells using stabilized ZrO2 (zirconia) as the solid electrolyte. Potential measurements were obtained from the cell Pt, Fe3O4, Fe2O3 || ZrO2 || Fe2O3, (Fe3O4)x(ZnFe2O4)1-x, Pt with the overall cell reaction Fe3O4 (pure solid) = Fe3O4 (in solid solution). The activity of Fe3O4 in solid solutions coexisting with Fe2O3 (hematite) exhibits a positive deviation from ideal solution behavior for the entire system. Equilibrium oxygen pressures for zinc oxyferrite solid solutions coexisting with Fe2O3 were calculated from the potential measurements. Partial and integral molar properties were derived for the Fe3O4-ZnFe2O4 system. Lattice parameter measurements of the Fe3O4-ZnFe2O4 solid solutions show a positive deviation from Vegard's law.
Keywords
Metallurgical-processes; Mineral-processing; Chemical-reactions; Metal-compounds; Metallic-compounds; Magnesium-compounds; Thermodynamic-reactions; Iron-compounds
CODEN
MTTBCR
Publication Date
19860901
Document Type
OP; Journal Article
Fiscal Year
1986
NTIS Accession No.
NTIS Price
Identifying No.
OP 144-86
Issue of Publication
3
ISSN
0360-2141
NIOSH Division
ALRC
Source Name
Metallurgical Transactions. B. Process Metallurgy
State
OR
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