The effects of cathode material and temperature on the separation factor in the electrolytic enrichment of deuterium are investigated in the temperature range 30° -60 °C. Mild steel cathodes give separation factors higher than those for nickel, silver, platinum and tin, whereas an alloy of mild steel +7.85% tin gives still higher separation factors. The temperature coefficient of the separation factor (da/dT) for cathodes of tin and for an alloy of mild steel + tin (62.3%) is positive, whereas for other cathodes studied, da/dT is negative. The temperature dependence of the separation factor is decreased by alloying mild steel with tin. It becomes zero for the alloy with 39.5% tin. there is a lowering of the separation factor at most 1 H. F. WALTON and J. H. WOLFENDEN, Nature, Lond. 138, 468 [1936]. e H. F. WALTON and J. H. WOLFENDEN, Trans. Faraday Soc. 34, 436 [1938].
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