Pressure of the Saturated Vapor of Nickel at High Temperatures

Two series of measurements of the saturated vapor pressure of crystalline and liquid nickel are carried out in the temperature range of 1270–1896 K using the integral version of the effusion method and Knudsen mass spectrometry. The enthalpy of sublimation of Ni at 0 K is calculated from the measurement results in accordance with the second _s H ₀ ⁰(II) and the third _s H ₀ ⁰(III) laws of thermodynamics. Good agreement between the vapor pressure values, determined by different methods under different experimental conditions, makes possible their joint treatment for crystalline and liquid nickel and leads one to recommend the value of _s H ₀ ⁰ = 425.3 ± 2.0 kJ/mol. The results obtained are compared with the available data of other authors.