Abstract
Abstract Ammonium amidotriphosphate (NH4)4P3O9NH2·H2O was heated at 5 K min−1 up to 100, 145, 180, and 240 °C in four different atmospheres: in a stream of dry air, humid air, ammonia, and dry hydrogen chloride. The products were analyzed by HPLC-FIA, X-ray diffractometry, and IR spectrophotometry. A new phase of ammonium cyclo-triphosphate was observed at lower temperatures, except for in the ammonia atmosphere. Oligophosphates (chain length=4–12) were more abundant in samples heated to 145 and 180°C in hydrogen chloride. The cyclo-tri- and oligophosphates were most probably formed via a zwitterion form. When heated to 240°C, the samples were changed to ammonium polyphosphates. Elemental analyses for the sample heated to 240°C in dry air showed that the ammonium polyphosphates formed contained some phosphorus-nitrogen bonds. Isothermal experiments at 180°C in dry air indicated that the new phase of ammonium cyclo-triphosphate was converted completely to ammonium polyphosphates.
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