THE PHASE-DIAGRAM OF THE AGNO3-KNO3 SYSTEM DETERMINED BY DIFFERENTIALSCANNING CALORIMETRY

The phase diagram for the AgNO3-KNO3 system has been determined using differential scanning calorimetry (DSC). Eutectic point has been found at 391 K and X(Ag) = 0.580 mole fraction AgNO3. The DSC curves indica te the existence of an intermediate compound (AgNO3.KNO3) in the KNO3- rich region of the phase diagram. This compound was identified in the solid phase by X-ray diffraction. The melting and the crystallization processes were followed with the aid of a hot stage microscope, too.