Abstract
Thermal decomposition of iron(II) and cobalt(II) hexaborates has been investigated. The methods applied to investigate the process were differential thermal analysis, derivatography, crystallooptics and x-ray study. The following iron(II) hexaborate hydrates, FeO · 3B2O3 · 7.5H2O, FeO · 3B2O3 · 5H2O, FeO · 3B2O3 · 0.5H2O; iron(III) borates, Fe2O3 · 6B2O3 and 2Fe2O3 · B2O3; cobalt(II)hexaborate hydrates CoO · 3B2O3 · 7.5H2O, CoO · 3B2O3 · 5H2O, CoO · 3B2O3 · 0.5H2O, CoO · 3B2O3 and the decomposition product 2CoO · 3B2O3 have been isolated. Hepta- and semihydrates of cobalt(II) and iron(II) hexaborates have been proved to be isomorphous. It has been established that in the case of cobalt and iron hexaborates the exothermic maximum refers to a decomposition reaction and to the formation of a borate containing a smaller proportion of boron and boric anhydride.
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