Abstract
The morphology of copper electrodeposits deposited on copper single crystal planes is affected by superimposing a sinusoidal alternating current (ac) on a direct current (dc). The effects of ac are discussed from a morphological point of view and from cathodic polarization studies. In the presence of superimposed ac on the (111) plane, hexagonal and triangular pyramids observed in pure solution change to layers, then to truncated triangular pyramids and blocks, and finally to a polycrystalline type of deposit. On the (100) plane, layers change to truncated pyramids and blocks, and finally to a polycrystalline type of deposit. On the (110) plane, ridges break up and give rise to a polycrystalline type of deposit. It was found that a superimposed ac has a depolarizing effect.
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