Abstract
Abstract Calcium bis(hydrogenphosphoramidate)–water (2/3) was made by adding an aqueous calcium chloride solution to an aqueous potassium hydrogenphosphoramidate solution. The product decomposed slowly to diammonium calcium diphosphate monohydrate in air at room temperature. When the product was heated above 600 °C, the decomposition product was β-type calcium metaphosphate. According to the result of the isothermal decomposition of the product at 150 °C in air, no formation of P–NH–P linkages by the elimination of NH3 from P–NH2 linkages was observed, and it was concluded that the phosphoramidate thermally decomposed to form only polyphosphates in air.
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