COMPOSITION AND THERMOCHEMISTRY OF THE EQUILIBRIUM VAPOR OF THE SYSTEMS NAI-FEI2 AND NAI-PBI2

The vaporization of NaI/FeI//2 and NaI/)PbI//2 samples of equimolar composition was investigated in the temperature ranges between 574 to 683 K and 562 to 669 K, respectively, by using the mass spectrometric Knudsen effusion method. The gaseous species I, I//2, NaI, (NaI)//2, FeI//2, (FeI//2)//2, FeI//3, NaFeI//3, and Na//2FeI//4 (NaI-FeI//2 system) as well as NaI, (NaI)//2, PbI//2, (PbI//2)//2, and NaPbI//3 (NaI-PbI//2 system) are present in the equilibrium vapors. The equilibrium partial pressures of these species were determined with the exception of I, I//2, and FeI//3.