Abstract
The thermal behavior of the gelatinous residues obtained by slowly evaporating sols of hydrous oxides of aluminum, iron and chromium has been studied. Some of the systems exhibited the “glow phenomenon,” i.e. glowed brightly when heated rapidly in open tubes, and gave exotherms with the differential thermal apparatus. The incidence of this behavior has been correlated with particle size of the oxides, as revealed by electron micrographs of the sols, as well as with the conditions under which the sols were prepared. Only single oxide systems showed the glow phenomenon. These results are reminiscent of the findings of Milligan et al. in X-ray studies of oxide systems. They found that oxides which undergo crystal growth when heated alone, fail to do so in the presence of other hydrous oxides.
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