Thermodynamic Study of Liquid In-Sb and In-Pb-Sb Alloys by the EMF Method Using Solid Electrolyte

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  • 固体電池起電力法によるIn-Sb系およびIn-Pb-Sb系液体合金の熱力学的研究
  • コタイ デンチ キデンリョクホウ ニ ヨル In Sbケイ オヨビ In Pb

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Abstract

The activities of indium in the binary and the ternary alloys were meaured by the EMF method using zirconia solid electrolyte over the temperature range of 873-1073 K. The activities of antimony in the binary alloys were calculated by using the Gibbs-Duhem equation. The activity values in the binary alloys are in close agreement with the results by Hoshino et al.<BR>From the activities of indium in the five pseudobinary systems of fixed molar fraction ratio NPb⁄NSb, the excess molar free energies of the liquid ternary alloys were calculated by means of Darken’s method. The values are negative in almost all compositions except those near the In-Pb side and become negatively larger as the concentration of lead decreases. The activities of the other two elements of the ternary alloys were calculated. Using the related binary data, the equation derived previously by us represents well the excess molar free energies of the ternary system.

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