Intensity Anomalies in Electron Diffraction Patterns of CuO

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Abstract
The oxide layer, giving the so‐called electron diffraction pattern and formed by heating copper in air at 600°C, has been examined by high‐resolution electron diffraction and electron microscopy. It is shown that the intensity anomalies which differentiate the pattern from the normal pattern are not due to impurities as has been suggested. The oxide grows in the form of long needle‐like spines approximately perpendicular to the copper surface, with one or more screw dislocations along the axis of each spine. Each spine is a single crystal of , about 1000 Å in diameter, elongated along the (110) zone axis. Intensity anomalies of the pattern result from this particular morphology.

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