Physicochemical transformations during synthesis of double K−Zr phosphates in a melt of potassium nitrate

Abstract

Double phosphates of K and Zr with three-dimensional and layered structure were synthesized in a melt of potassium nitrate in the temperature range of 300–550°C. The double phosphates were formed with participation of three components of a reaction mixture: ZrOCl2·8H2O−(NH4)2HPO4−KNO3, in which potassium nitrate was both an active component of the reaction mixture and the reaction medium. The influence of the nature of the starting reagents on the composition of the reaction products and on the sequence and stoichiometry of the reactions proceeding, in the reaction mixture were studied by thermogravimetry and mass-spectrometry.