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Oxidation of Sintered Cobalt Oxide
Author(s) -
OTT W. R.,
RANKIN D. T.
Publication year - 1979
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1979.tb19054.x
Subject(s) - spinel , oxide , cobalt , cobalt oxide , pellets , reaction rate constant , decomposition , kinetics , chemistry , rate equation , reaction rate , materials science , inorganic chemistry , metallurgy , catalysis , composite material , physics , biochemistry , organic chemistry , quantum mechanics
The kinetics and mechanism of the oxidation of sintered pellets of CoO and Co 0.5 Mg 0.5 O in air at high temperatures were investigated to find stable heat sources containing 60 Co. The initial stages of oxidation of both materials were nuclei‐growth‐controlled, i.e. In [1/(1‐X)] =kt m . The reaction rate constant for CoO decreased at 800° to 960°C, the temperature where the cobalt oxide spinel decomposed. The reaction‐rate constant for decomposition of the mixed oxide was maximum at 700°C and decreased at higher temperatures. This decrease confirmed the validity of the nuclei‐growth solid‐state reaction‐rate equations.