Physico-chemical studies of MgNa 3

A magnesium-sodium triphosphate MgNa3P3O10·12H2O already known has been prepared by the method of ion exchange resin of aqueous chemistry and studied by X-Ray diffraction, thermal analyses (TGA-DTA), differential scanning calorimetry (DSC) and infrared spectrometry which show the characteristic bands of a triphosphate P3O. The results of differential thermal analysis, X-Ray powder diffraction and IR spectra of the compound heated at different temperatures showed that, after dehydration, MgNa3P3O10·12H2O decomposes into an amorphous compound, then it crystallizes at 600 ° C in order to give the anhydrous triphosphate MgNa3P3O10. MgNa3P3O10 is stable until its melting point at 612 ° C. Two different methods Ozawa and KAS have been selected in studying the kinetics of thermal behavior of the triphosphate P3O10 for the first time. The kinetic and thermodynamic characteristics of the dehydration of MgNa3P3O10·12H2O and the thermal phenomena accompanying this dehydration were determinated and discussed on the basis of the proposed crystalline structure