Study on the realization of zinc point

Two zinc-point cells were fabricated using high grade zinc samples, impurity elements of one of which were analyzed extensively. Temperature measurements during the solid-liquid coexistence, under which the zinc fixed-point is defined, were conducted, the result of which was used to perform a thermal analysis. Comparisons of zinc-point temperature realized within the newly fabricated cells were also conducted. Zinc-point depression due to impurity elements was calculated based on the chemical element analysis. Evaluation was made on the thermal analysis, the cell comparison results and the chemical element analysis, to lead to an estimation of uncertainty caused by the impurity elements. The present paper outlines the cell fabrication, the temperature measurements and the evaluation of impurity effect to the zinc-point realization.