Bulletin of the Chemical Society of Japan p. 2843 - 2848 (1987)
Update date:2022-08-12
Topics:
Ohtsuka, Kunio
Koga, Johji
Suda, Mitsuru
Ono, Mikiya
Takahashi, Minoru
Cobalt(II) hydroxide-(sodium fluoride tetrasilicic mica) intercalation complexes were prepared by titrating cobalt(II) nitrate solutions in the presence of mica with sodium hydroxide under oxygen-free conditions.These complexes were characterized by chemical analysis, XRD, DTA-TGA, IR, and surface area measurements.These confirmed that the brucite-like cobalt(II) hydroxyde sheet developed within the interlayer of the silicate.Cobalt atoms reduced at 400-700 deg C by H2 migrated from the interlayer of the silicate to the external surface of these where highly dispersed cobalt particles were formed.Ultra-fine cobalt metals (50-200 Angstroem) with a hexagonal close-packed form were prepared at 400 deg C by H2.The degree of reduction and the grain diameter of cobalt increased with an increase of the reducing temperature and/or the reducing time.
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