Enthalpy of Formation of Cu2PbO2 and Revision of the Cu2O-PbO Phase Diagram


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The stoichiometric compound Cu2PbO2 has been synthesized by solid-state reaction from Cu2O and PbO in a sealed quartz ampoule. The optimum synthesis conditions are 910 K and 260 h. The enthalpy of formation of Cu2PbO2 has been measured with the use of high-temperature calorimeter. The enthalpy of reaction Cu2O + PbO = Cu2PbO2 is – 25.4 ± 1 kJ·mol-1 at temperature 968 ± 5 K. Standard enthalpy and Gibbs energy of formation of the Cu2PbO2 compound from elements and its entropy at 298.15 K are DfH° = – 413.086 kJ·mol-1, DfG° = – 353.165 kJ·mol-1 and S° = 135.165 J·mol-1·K-1. The eutectic reaction L → Cu2O + PbO was found to occur at 1017 ± 5 K. Using the thermodynamic database for Cu-Pb-O system the revised Cu2O-PbO phase diagram is proposed.



Edited by:

Dragan P. Uskokovic, Slobodan K. Milonjic, Djan I. Rakovic




M. Čančarević et al., "Enthalpy of Formation of Cu2PbO2 and Revision of the Cu2O-PbO Phase Diagram", Materials Science Forum, Vol. 494, pp. 67-72, 2005

Online since:

September 2005




[1] E. Gebhardt and W. Obrowski: Z. Metallkd. Vol. 45 (1954), p.332.

[2] K. Fischer: Cryst. Res. Technol. Vol. 14 (1979), p.835.

[3] W. Hofmann and J. Kohlmeyer: Z. Metallkd. Vol. 45 (1954), p.339.

[4] H. Szillat and C.L. Teske: Z. Anorg. Allgem. Chem. Vol. 620 (1994), p.1307.

[5] M. Cancarevic, M. Zinkevich and F. Aldinger: submitted to Z. Metallkd.

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