Activity Measurement on Cd-Zn Alloy with a Newly Constructed Knudsen Cell-Mass Filter System

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  • Nakazawa Shigeatsu
    Research Institute of Mineral Dressing and Metallurgy, Tohoku University
  • Yazawa Akira
    Research Institute of Mineral Dressing and Metallurgy, Tohoku University
  • Taniuchi Kentaro
    Research Institute of Mineral Dressing and Metallurgy, Tohoku University

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  • クヌーセンセル-マスフィルタによるCd-Zn系の活量測定
  • クヌーセンセルーマス フィルタ ニヨル Cd Znケイ ノ カツリョウ ソクテ

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Abstract

A Knudsen cell-quadrupole mass filter combination system was constructed for the purpose of studying the physical chemistry of metallurgical solutions.<BR>This analyzer was employed because of several advantages inherent in its measuring principles.<BR>The applicability of the apparatus for the determination of activities was examined by conducting the measurement of activities in the liquid Cd-Zn system. The system was chosen because of experimental easiness, i.e., low fusing temperature of the alloy and similar vapor pressures of the components. Furthermore, the comparison with the literature data can be made. Ion intensities of the principal isotopes of the components (48114Cd and 3064Zn) which are thought to be proportional to the equilibrium partial pressures over the alloy were recorded over the temperature range 450∼700 K and the whole region of the binary system. By using the ion-current ratio method, the thermodynamic property at 667 K was calculated. The activity coefficients can be represented over the whole composition region by the following equations: logγCd(1)=(1.35⁄2)XZn2 and logγZn(1)=(1.35⁄2)XCd2 at 667 K. These results were converted to those at 800 K on the assumption of regular-solution behavior, and it was found that they are in good agreement with the values proposed by Hultgren et al.

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