PHYSICOCHEMICAL TRANSFORMATIONS DURING SYNTHESIS OF DOUBLE K-ZR PHOSPHATES IN A MELT OF POTASSIUM-NITRATE

Double phosphates of K and Zr with three-dimensional and layered struc ture were synthesized in a melt of potassium nitrate in the temperatur e range of 300-550 degrees C. The double phosphates were formed with p articipation of three components of a reaction mixture: ZrOCl2 . 8H(2) O-(NH4)(2)HPO4-KNO3, in which potassium nitrate was both an active com ponent of the reaction mixture and the reaction medium. The influence of the nature of the starting reagents on the composition of the react ion products and on the sequence and stoichiometry of the reactions pr oceeding in the reaction mixture were studied by thermogravimetry and mass-spectrometry.