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Direct activity measurements in liquid Ag−Cu alloys using a valved knudsen cell-mass spectrometer system

  • Physical Chemistry
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Abstract

The primary objective of this investigation was to demonstrate a new method of measuring activities. The mass spectrometric analysis of effusates from a unique valved Knudsen cell was used to determine the activity of Ag in the liquid Ag−Cu system at 1400 K. The alloy compositions were varied from one composition extreme to the otherin situ. The system exhibits positive deviation from ideal behavior, and the results are in agreement with previous investigations and are summarized by the equation

$$1n\gamma _{{\rm A}g} = \left( {1.116 \pm 0.034} \right)\left( {1 - X_{Ag} } \right)^2 $$

The valved Knudsen cell method is applicable to activity studies of both binary and multicomponent systems.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, South Dakota School of Mines and Technology, 501 E. St. Joseph Street, 57701, Rapid City, SD

    Stanley M. Howard (Professor)

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  1. Stanley M. Howard
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Howard, S.M. Direct activity measurements in liquid Ag−Cu alloys using a valved knudsen cell-mass spectrometer system. Metall Trans B 20, 845–852 (1989). https://doi.org/10.1007/BF02670189

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