Phase Equilibria and Activities of the Constituents in FeOCr2O3-MgOCr2O3 Spinel Solid Solution Saturated with Cr2O3

Mitsutaka Hino, Ken Ichi Higuchi, Tetsuya Imagasaka, Shiro Ban-Ya

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)

Abstract

The phase equilibria and the activities of the constituents in FeOCr2O3-MgOCr2O3 spinel solid solution saturated with Cr2O3 have been determined at temperature ranging from 1 423 to 1 723 K, by the equilibrium of iron dissolved in liquid silver held in spinel crucible with CO-CO2 gas mixture, to clarify the thermodynamic properties of chromium ores in chromium ore smelting reduction process being recently developed. The solubility of FeOCr2O3-MgOCr2O3 spinel in Cr2O3 was found to be negligible. On the other hand, very small solubility of Cr2O3 in the spinel was observed, but the nonstoichiometry of spinel solid solution was insignificant and spinel phase was reasonably approximated as stoichiometric (Fe, Mg)OCr2O3. The free energy of formation of FeO-Cr2O3 was determined as [formula omitted]. The activities of constituents in FeOCr2O3-MgOCr2O3 spinel solid solution coexisted with Cr2O3 showed negative deviation from ideality. It was observed that the spinel solid solution takes regular solution behavior, and α-function of FeOCr2O3-MgOCr2O3 system was determined as follows; [formula omitted].

Original languageEnglish
Pages (from-to)739-745
Number of pages7
JournalIsij International
Volume34
Issue number9
DOIs
Publication statusPublished - 1994

Keywords

  • FeO Cr2O3-MgOCr2O3
  • activity
  • iron-chromite
  • magnesium-chromite
  • solid solution
  • spinel
  • thermodynamics

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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