Oxygen potentials, Gibbs' energies and phase relations in the Cu-Cr-O system

Jacob, K. T. ; Kale, G. M. ; Iyengar, G. N. K. (1986) Oxygen potentials, Gibbs' energies and phase relations in the Cu-Cr-O system Journal of Materials Science, 21 (8). pp. 2753-2758. ISSN 0022-2461

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Related URL: http://dx.doi.org/10.1007/BF00551483


Thermodynamic properties of ternary compounds, cuprous and cupric chromites (CuCrO2, CuCr204), and oxygen potentials corresponding to three three-phase regions in the Cu-Cr-O system have been measured in the temperature range 900 to 1350 K using a solid state galvanic cell incorporating calcia-stabilized zirconia. Cuprous chromite was found to be nearly stoichiometric. The compositions of non-stoichiometric cupric chromite saturated with CuO and Cr203 have been determined using electron microprobe and energy dispersive X-ray analysis. The results of this study resolve discrepancies in Gibbs" energies of cuprous and cupric chromites reported in the literature. A ternary phase diagram for the Cu-Cr-O system at 1150 K and phase relations in air for the Cu20-CuO-Cr203 system as a function of temperature have been derived based on the new thermodynamic data. The phase diagram given in the literature is found to be inaccurate.

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ID Code:12946
Deposited On:11 Nov 2010 08:21
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