Abstract
Calcium fluoride solid electrolyte has been extensively used in galvanic cells for the measurement of fluorine potential to obtain the activity of alloys and compounds, because the ionic transference number of the electrolyte is about unity even at PF2⁄P0=10−62 above 550°C. So far there were no literature data available for the measurement below 500°C by use of the calcium fluoride solid electrolyte.In this report, a trial has been made to measure the fluorine potential in a molten zinc bath equilibrated with ZnF2 at the temperatures between 450∼500°C using CaF2 cells with some kinds of reference electrode. By use of Bi, BiF3 or Zn, ZnF2 as the reference electrode, the cells respond quickly and stable emf values which agree fairly well with the literature data are obtained. The effects of the atmoshere around the reference electrode and the cell construction on the cell stability and reproducibility have been investigated experimentally.
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