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Study of the oxidation and reduction kinetics of copper iron oxide [CuFeO2] in the Cu-Fe-O system

Authors
Journal
Materials Research Bulletin
0025-5408
Publisher
Elsevier
Publication Date
Volume
32
Issue
10
Identifiers
DOI: 10.1016/s0025-5408(97)00126-8
Keywords
  • A. Oxides
  • C. Electron Microscopy
  • C. X-Ray Diffraction
  • D. Phase Equilibria

Abstract

Abstract The effect of surrounding atmosphere on the phase relations of CuFeO 2 during crystal growth was investigated under CO 2, Ar, Ar + 0.5% O 2, Ar + 1% O 2, and Ar + 2% O 2, respectively, using scanning electron microscopy (SEM) together with electron probe microanalysis (EPMA) and X-ray powder diffraction (XPD). CuFeO 2 was found to have partially decomposed into Cu 2O and Fe 2O 3 before melting, and crystal growth was progressed by means of the traveling-Cu 2O solvent. Under CO 2 and Ar, Cu 2O was found to be reduced to Cu. No reduction of Cu could be found under Ar + 0.5% O 2, Ar + 1% O 2, and Ar + 2% O 2 atmospheres, whereas the reduction of CuO was observed Under an Ar + 2% O 2 atmosphere.

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