Abstract
The mechanism of initial formation and growth of Au plate crystals on Fe single crystals or polycrystals electrodeposited from hydrochloric auric chloride bath was examined by electron microscopy.The results obtained were as follows:(1) The population of nuclei or micro-particles of Au electrodeposited in the initial stage of deposition was about 3×1011cm-2. On further deposition, Au micro-crystals were connected one another by feather-like thin plate crystals and were formed into islandshaped or net-work structure.(2) The Au micro-particles of scores of Å in size gave a spotty diffraction ring pattern and the Au plate crystals gave distinctly arced or spotty arced diffraction pattern.(3) The stable coherency between the Au plate crystals and Fe substrate was formed when the surface coverage was about 80%. The coherency was as follows:(001)Fe//(001)Au [110] Fe//[010]Au}(4) The plate crystals at the stage of the surface coverage of 85% had many sub-grains of 150-400Å in diameter. With the progress of electrodeposition, the diameters of the sub-grains were increased.(5) In the plate crystals, there were some Au particles having crystal orientations different from those of the plate crystals.(6) In the plate crystals, there were observed many microtwins, which contributed to the relaxation of strain in Au plate crystals.
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