Abstract
On the surface of iron deposited from a ferrous sulphate solution under potentiostatic conditions tetragonal growth pyramids are formed. At low overvoltages the tetragonal pyramids, and at high overvoltages the trigonal pyramids, prevail. The respective tangents of the angels between the sides and the bases of the pyramids are proportional to the overvoltage. The distance of the growth steps at the sides of the tetragonal pyramids are inversely proportional to the overvoltage. The height of the growth steps in nearly equal to the height of the unit cell, takin into account the most probable texture of the iron deposit. On the assumption that the pyramids grow at screw dislocations, the specific edge energy of the growth steps is calculated.
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