Abstract
Further consideration is given to the determination of the thermodynamic properties of metallurgical solutions by mass-spectrometric analysis of the equilibrium vapor effusing from a Knudsen cell. Equations are presented which permit the application of the integration of ion-current ratios to complex species, thus avoiding problems caused by fragmentation ionization. The method is applied to a limited study of the Bi-Te system at 750°C. Ternary systems are considered and the method for the determination of the properties from measurements of a pair of ion-currents is demonstrated. Equations are also derived for the treatment of a ternary system which is saturated with respect to an involatile component. Finally, a method is presented for correcting the monomer-dimer ratio technique of Berkowitz and Chupka for fragmentation ionization effects.
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Belton, G.R., Fruehan, R.J. The determination of activities by mass-spectrometry—some additional methods. Metall Trans 2, 291–296 (1971). https://doi.org/10.1007/BF02662673
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DOI: https://doi.org/10.1007/BF02662673