Abstract
The vapor composition over and thermodynamic properties of crystalline nickel–phosphorus alloys (26–32.5 at. % P) are studied by Knudsen cell mass spectrometry between 971 and 1440 K. Mass spectra of the saturated vapor in the Ni–P system indicate the presence of the Ni+, P+ 2, and P+ ions. The P concentration in the vapor phase does not exceed 1% of the Р2 concentration. The experimental data are used to evaluate the complete set of thermodynamic functions of nickel phosphides. Based on the data for the low-temperature (α, γ) and high-temperature (β, δ) forms of Ni5P2 and Ni12P5 , the thermodynamic characteristics of the corresponding polymorphic transformations are evaluated. The results obtained for a large number of compositions under different experimental conditions (different effusion-cell and coating materials and effusion-orifice diameters) coincide to within the experimental error and are in good agreement with earlier reported phase-equilibrium data and enthalpies of formation, attesting to the high accuracy and reliability of the calculated thermodynamic functions.
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Zaitsev, A.I., Zaitseva, N.E. & Shakhpazov, E.K. Thermodynamic Properties of Intermediate Ni–P Phases (26–32.5 at. % P) between 971 and 1440 K. Inorganic Materials 39, 427–432 (2003). https://doi.org/10.1023/A:1023643721556
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DOI: https://doi.org/10.1023/A:1023643721556