The platinum deposits overgrown on iridium and tungsten are polycrystalline with a crystal size of 50–500 Å. The orientation is mainly [111]. Some deposits on iridium grow epitaxially. A variety of defects, such as twinning, vacancy clusters, and high dislocation density (1011/cm2), are observed. Additionally, some experiments with copper deposits on iridium and tungsten are described. The corrosion of field‐evaporated iridium tips both in air and in the plating solution is studied prior to the application of the electroplating.

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