THE WHITE TIN → GREY TIN TRANSITION IN TIN–MERCURY ALLOYS

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Abstract
The effect of the addition of mercury on the linear rate of white tin (β) → grey tin (α) transformation in a number of dilute tin-binary alloys has been examined. Rates of transformation at −78° and −25 °C are shown for binary alloys of zone-refined tin and aluminum, arsenic, bismuth, germanium, indium, lead, antimony, and zinc, and also for a number of commercially pure tins. The resultant rates of all of these upon further alloying with 0.6 at.% Hg are likewise given. At −78 °C, the addition of mercury always produces a very low transformation rate, approximately 4×10−4 mm/hr. However, at −25 °C, an increase in rate is observed in certain cases.The results are discussed and a theory is developed to account for them and also to predict the effect of mercury on the β → α transition in any tin-binary system.

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