THERMAL-BEHAVIOR OF FERROUS DIFLUORODIOXO PHOSPHATE

Difluorodioxophosphates may be used as ceramic phosphate precursor, an d their thermal behaviours are very important. In this paper we study by TG and DTA the thermal stability for iron(II) salt. In argon atmosp here, we obtain in a first time the melting of salt at 240-degrees-C t hen the classical breaking up into solid orthophosphate and POF3 exhau st. If the sample of iron(II) difluorodioxophosphate is heating in air , we do not obtain the melting phenomena, but at the same temperature an exothermic phenomenon that conducts to the formation of iron(III). We observe a mass increase. By IR analysis, we can show that this oxid ation is obtained without change of difluorodioxophosphate structure.