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The thermoanalytical techniques of differential thermal analysis and thermogravimetry have been used to elucidate the thermal phenomena occurring as the binary oxidant system potassium perchlorate-barium nitrate is heated to elevated temperatures. The fusion, at 465°, of a eutectic mixture immediately precedes the barium nitrate catalyzed decomposition of potassium perchlorate. The thermal instability of the eutectic mixture precludes its study by conventional cooling curve techniques. Therefore, the eutectic composition, nominally 2 to 1 potassium perchlorate-barium nitrate, was obtained from the integrated areas of the fusion endotherms on the DTA curves for a series of mixtures. It is noted that the presence of potassium ion, in addition to that of barium ion, provides increased thermal stability for the nitrate ion.

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