銅単結晶面に電着したFe-Co合金の結晶成長

抄録

Crystal structure and orientation of Fe-Co alloy electrodeposited from mixed solutions of Fe and Co sulfates on electrolytically eched or polished (111), (100), (110) and (311) faces of Cu single crystal are examined by means of electron diffraction. The results obtained are as follows.
(1) When the alloy is deposited at low c. d. from a solution composed of 0.75 mol/l of Co sulfate and 0.25 mol/l of Fe sulfate, only γ alloy (f. c. c.) of parallel orientation is formed att first, then a phase (b. c. c.) begins to coexist, and in later stage of the deposit, only a alloy grows.
Orientations of α alloy on any of the substrate surfaces mentioned above are mostly formed in such a way that the substrate and the deposit have similar arrangements of atoms on their planes of mutual contact.
(2) When the alloy is deposited from a solution composed of 0.25 mol/l of Co sulfate and 0.75 mol/l of Fe sulfate, only a alloy grows from the start independently of c. d.
Orientations of α alloy deposited from this solution are similar to those of Fe electrodeposited on Cu single crystal.
(3) Net plane of α alloy oriented on any of the substrate faces except (111) faces is not exactly parallel to that of the substrate at the initial thin layer, but is oblique to some axis on the substrate face. As thickness increases, such inclination decreases and the net plane of the deposit becomes parallel to that of the substrate.
(4) {211} twins of α alloy are formed when the deposit becomes thick and, with them irrational spots appear.