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The effects of pressure and temperature upon the rate and mechanism of the reaction between plutonium and deuterium have been studied for temperatures to 400/sup 0/C at pressures from 1 to 15 kPa. The rate was determined by measuring the weight changes of plutonium disks as the reaction proceeded. Below 200/sup 0/C the reaction product spalled to expose fresh metal. The equation R = k/sub T/AP/sup 0/./sup 6/ fits the data, where the rate R is the milliequivalents of deuterium reacting per hour, A is the geometrical surface area, P is the deuterium pressure, and k/sub T/ is the velocity constant at temperature T. The energy of activation for the spalling reaction is 5.9 kcal . mol/sup -1/ for PuD/sub 2/./sub 7/. Between 250 and 400/sup 0/C the product adhered to the parent metal to form a growing layer. The equation R = k/sub T/*AP/..delta..W fits the rate data, where R, A, and P are defined above, ..delta..W is the measured weight change in milliequivalents of deuterium, and k/sub T/* is the velocity constant at temperature T.

Reaction between plutonium and deuterium. Part I. Rate measurements by pressure changes