The effect of oxidisation on the surface characteristic temperature of copper particles

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Abstract
The effect of the oxidisation of fine copper particles with average sizes 100 and 160 AA on the characteristic temperature theta p was studied by the powder X-ray diffraction method, theta p was found to be scarcely affected by the oxidisation. On the basis of the Einstein oscillator model for the thermal vibration of a two-dimensional lattice consisting of oxide on the metal surface, it is shown that although the original frequency splits into two parts, corresponding to the acoustic and optic modes, such a separation has little influence on the surface characteristic temperature, in agreement with the experimental results. Observations of the oxidisation and coalescence of fine copper particles were also made.