Abstract
The formation and morphology of galvanically substituted Ag films, which had been deposited on Cu single-and poly-crystals from a solution containing silver cyanide and sodium cyanide, were examined by electron microscopy.The results obtained were as follows:1) In the early plating stage, the density of Ag micro-particles was about 1.5×1012cm-2.2) The primarily deposited Ag micro-particles cohered one another or individually grew up into insular crystals, which were further linked together to form network plate crystals.3) No coherency was observed between the primary Ag microparticles and Cu planes. However, the difference in orientation between the both was gradually decreased with the increase of the plate crystals, and a stable coherency was observed when the crystals were completely grown up into network structure.4) The coherency was as follows:(001) Cu//(001) Ag [100]Cu//[100]Ag}……(1)(110) Cu//(110)Ag [110]Cu//[110]Ag}……(2)(111) Cu//(111)Ag [110]Cu//[110]Ag}……(3)5) In the Ag plate crystals, there were found many micro-twins and stacking faults, which contributed to the relaxation of stress due to the misfit between the Ag films and Cu substrate.6) When Cu was dipped in the B-2 solution (AgCN 7.5g/l, NaCN 30g/l) for a long time, there were observed particles of 0.5-2μ in size on the Ag Plate crystals. Some of the particles cohered one another to make up spheroidal crystals.
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