Abstract
The equilibrium phase relationships near the liquidus line of the system Cu2O-CuO-O2 (a part of wider system Cu-O) were determined under pure oxygen pressure from 0.001 to 11 MPa by three experimental methods: differential thermal analysis (DTA), thermogravimetry (TG), and thermobarometry (TB). The coordinates of the eutectic point between solid Cu2O and CuO were found to be P O 2=0.069±0.001 MPa and T=1364±1 K. It was proved experimentally that, at least at temperatures up to 1526 K and oxygen pressures up to 11 MPa, CuO melts incongruently with liberation of gaseous oxygen and with the temperature dependence of P O 2 obeying an Arrheniustype equation. The conditions for congruent melting of CuO were analyzed using the model, and it was found that congruent melting of CuO should occur at ≈ 1620 K under oxygen pressure ∼1000 MPa.
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References
F.H. Smyth and H.S. Roberts: J. Am. Chem. Soc., 1920, vol. 42, pp. 2583–2607; H.S. Roberts and F.H. Smyth: J. Am. Chem. Soc., 1921, vol. 43, pp. 1061–79.
R. Vogel and W. Pocher: Z. Metallkd., 1929, vol. 21 (10), pp. 333–37 and vol. 21 (11), pp. 368–71 (in German).
A.M.M. Gadalla, W.F. Ford, and J. White: Trans. Br. Cer. Soc., 1963, vol. 62, pp. 45–66.
S.H. Sadat-Darbandi: “Determination of Equilibrium and Transport Properties of the Liquid Phases of the System Copper-Oxygen,” Ph.D. Dissertation, Technical University of Berlin, Berlin, 1977 (in German).
V.V. Sytchev, A.A. Vasserman, A.D. Kozlov, G.A. Spiridonov, and V.A. Tsymarnyi: Thermodynamic Properties of Oxygen, Izdatel’stvo Standartov, Moscow, 1981 (in Russian).
R. Schmid: Metall. Trans. B, 1983, vol. 14B, pp. 473–81.
J. Karpinski and E. Kaldis: J. Cryst. Growth, 1986, vol. 79, pp. 477–83.
I.S. Kulikov: Thermodynamics of Oxides (Reference Book), Metallurgia, Moscow, 1986, p. 225 (in Russian).
I.L. Aptekar’, A.V. Kosenko, A.A. Zhokhov, V.M. Masalov, and G.A. Emel’chenko: Superconductivity, 1991, vol. 4, pp. 710–14.
A. Boudène, K. Hack, A. Mohammad, D. Neuschütz, and E. Zimmermann: Z. Metallkd., 1992, vol. 83, pp. 663–68.
B. Hallstedt, D. Risold, and L.J. Gauckler: J. Phase Equilibria, 1994, vol. 15, pp. 483–99.
A.V. Kosenko and G.A. Emel’chenko: Functional Mater., 1996, vol. 3, pp. 52–54.
V.A. Lysenko: Neorganitcheskie Materialy, 1998, vol. 34, pp. 1108–14 (in Russian).
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Kosenko, A.V., Emel’chenko, G.A. Equilibrium phase relationships in the system Cu-O under high oxygen pressure. JPE 22, 12–19 (2001). https://doi.org/10.1007/s11669-001-0050-x
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DOI: https://doi.org/10.1007/s11669-001-0050-x