Activities of the constituents in FeO·Cr2O3-MgO·Cr2O3-MgO·Al2O3 spinel solid solution

Mitsutaka Hino, Ken ichi Higuchi, Tetsuya Nagasaka, Shiro Ban-ya

Research output: Contribution to journalArticlepeer-review


The activity of iron chromite in solid FeO·Cr2O3-MgO·Cr2O3-MgO·Al2O3 spinels, saturated with (Cr,Al)2O3, was determined at 1573 K, by the equilibrium of iron dissolved into liquid silver in the spinel crucible with CO-CO2 gas mixture, to clarify the thermodynamic properties of chromium ores used in ferrochromium industry. The phase relation between (Cr,Al)2O3 and FeO·Cr2O3-MgO·Cr2O3-MgO·Al2O3 spinel phase was studied, and the solubility of (Cr,Al)2O3 in FeO·Cr2O3-MgO·Al2O3, MgO·Cr2O3-MgO·Al2O3 and FeO·Cr2O3-MgO·Cr2O3-MgO·Al2O3 spinel phases was found to be small. The activity of FeO·Cr2O3 in FeO·Cr2O3-MgO·Cr2O3-MgO·Al2O3 spinel solid solution coexisted with (Cr,Al)2O3 shows negative deviation from ideality. It was observed that the spinel solid solution took regular solution behavior, and α-function of each pseudo-binary in FeO·Cr2O3-MgO·Cr2O3-MgO·Al2O3 system was determined as follows; αFeO·Cr(2)O(3)-MgO·Al(2)O(3)=-92,000 (J), αMgO·Cr(2)O(3)-MgO·Al(2)O(3)=-30,000 (J).

Original languageEnglish
Pages (from-to)825-830
Number of pages6
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Issue number11
Publication statusPublished - 1994

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry


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