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| ON THE OXYGEN PARTIAL PRESSURE AND ACTIVITY OF FeTiO_3-MgTiO_3 SOLID-SOLUTION SYSTEM |
| LI Guoxun; Cao Rongjiang (General Research Institute of Nonferrous Metals; Ministry of Metallurgical Industry; Beijing) |
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Cite this article:
LI Guoxun; Cao Rongjiang (General Research Institute of Nonferrous Metals; Ministry of Metallurgical Industry; Beijing). ON THE OXYGEN PARTIAL PRESSURE AND ACTIVITY OF FeTiO_3-MgTiO_3 SOLID-SOLUTION SYSTEM. Acta Metall Sin, 1982, 18(3): 371-377.
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Abstract The oxygen partial pressure and activity of FeTiO_3-MgTiO_3 solid-solution system were studied by means of oxygen concentration cell with the solid electrolyte. Taken Fe/FeO as reference electrode, the oxygen partial pressure was measured, and standard free enthalpy of formation of non-stoichiometric FeO (w/istite) was obtained as ΔG_(FeO)~0=-259030+60.25T (J·mol~(-1)). Furthermore, the oxygen partial pressure and wustite activity of the various compositions of the solid-solution system were measured at the temperature range of 900—1200℃. The results show that both values increase with the increase of temperature. The standard free enthalpy of formation of complex oxide FeTiO_3, ΔG_(FeTiO_3)~0=-40470+19.75T (J·mol~(-1)) and the activity-composition relation of this solid-solution series were obtained.
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Received: 18 March 1982
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