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The effect of copper(II) on the Formation of Magnetite from Colloidal Iron (II) Hydroxide
Author(s) -
Inouye K.,
Murata K.,
Ishikawa T.
Publication year - 1971
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19713860312
Subject(s) - magnetite , hydroxide , copper , chemistry , colloid , activation energy , atmospheric temperature range , decomposition , materials science , inorganic chemistry , crystallography , metallurgy , thermodynamics , organic chemistry , physics
The rate of self‐decomposition of iron(II) hydroxide doped with various amounts (0–6 atomic%) of Cu(II) was determined in the absence of oxygen at the temperature range of 30 to 50°C. The maximum rate and the minimum activation energy were observed at 1% Cu/Fe. The result was attributed to the two simultaneous actions of Cu 2+ , i.e., the distortion effect on coordination complex of Fe 2+ by Cu 2+ to ease the structural transformation to magnetite and the hindering effect on magnetite formation revealed consequently in the growth of Fe(OH) 2 crystals. Both effects were proved by X‐ray diffraction and election‐microscopic observations.