Gunji Shinoda1, Yoshitsugu Amano1
Crystal structure of high purity Mn electrically deposited from sulphate solution was investigated by X-ray method using Fe-and Cr-K X-rays. Sometime, freshly prepared specimen shows tetragenal γ structure and this transforms to cubic α gradually at room temperature. The lattice constant of α-Mn was 8.89885 Å at 18°, somewhat larger than those previously reported values and this does not change by annealing. Therefore, no hydrogen was occluded as solid solution nor any internal strains exist. Lines obtained by large glancing angle were very diffuse, and this did not change by low temperature annealing; so the sizes of grains must be very small and only about 130 Å. When the specimen was investigated by Lane method, continuous Debye-Scherrer rings having almost uniform intensity were obtained. The fibrous structures must be very poor. But, intense(332)lines and faint (330), (411) lines were observed when the photographs were taken parallel to the direction of electrodeposi-tion. Therefore, there must exists some regularities in the arrangement of crystallites, and perhpas [III] axis will coincides with the direction of crystal growth. This was verified by the microscopic investigation.
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