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To clarify the oxidation mechanism of Cu2O to CuO, Cu2O oxidation was studied at 600–1050 °C under 1atm O2. The Cu2O specimens were prepared through completely oxidizing 99.99999 and 99.5 pure copper at 1000°C in an Ar + 1 O2 atmosphere. The oxidation kinetics of Cu2O specimens prepared from both purity levels followed the logarithmic law, not the parabolic law or the cubic law as reported in the...
In order to study the influence of small amount of impurities on the copper oxidation kinetics, the oxidation was examined at 600–1050°C in 0.1 MPa oxygen atmosphere using 99.5% (2N) and 99.9999% (6N) pure copper specimens. The influence of impurities has been discussed considering the roles of the nonprotective CuO layer, the impurity layer at the Cu2O–Cu interface, and the diffusion of copper in...
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