Cobalt(II,III) oxide decomposes to cobalt(II) oxide at 950 °C:[6]
2 Co3O4 → 6 CoO + O2
http://en.wikipedia.org/wiki/Cobalt(II)_oxide
[6]US 4389339, James, Leonard E.; Crescentini, Lamberto & Fisher, William B., "Process for making a cobalt oxide catalyst"
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