Abstract:
The composition of combustion products of calcium hypophosphite Ca(H$_2$PO$_2$)$_2$ with sodium or potassium nitrates or nitrites as oxidizers in air at atmospheric pressure has been studied. Synthesis was carried out to obtain double phosphate of the composition Na(K)CaPO$_4$. Mixtures of powders with zero oxygen balance were prepared using, if necessary, an additional amount of ammonium nitrate. The phase composition of condensed combustion products was studied by X-ray powder analysis. The mixtures burned stably at atmospheric pressure releasing P$_4$O$_{10}$ aerosol. The combustion products were melted white particles up to 1 mm in size. In condensed combustion products were found to contain the double phosphates NaCaPO$_4$, Na$_2$CaP$_2$O$_7$, K$_2$CaP$_2$O$_7$, and KCaPO$_4$ and calcium pyrophosphates Ca$_2$P$_2$O$_7$.
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