Abstract
The phase diagram of the Cr-W-O system at 1000° C was established by metallographic and X-ray identification of the phases present after equilibration in evacuated silica capsules. Two ternary oxide phases, CrWO4 and Cr2WO6 were detected. The oxygen potential over the three-phase mixtures, W+Cr2O3 s+CrWO4, WO2.90+CrWO4+Cr2WO6 and Cr2O3+CrWO4+Cr2WO6, were measured by solid state cells incorporating Y2O3 stabilized ZrO2 electrolyte and Ni+NiO reference electrode. The Gibbs' energies of formation of the two ternary phases can be represented by the following equations
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Jacob, K.T. Phase relationships in the system Cr-W-O and thermodynamic properties of CrWO4 and Cr2WO6 . J Mater Sci 15, 2167–2174 (1980). https://doi.org/10.1007/BF00552303
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DOI: https://doi.org/10.1007/BF00552303