Diffusivity of carbon in molybdenum

In a recent report Kimura and Yoshioka (1976) have discussed the possible mechanisms underlying the positive curvature observed at high temperatures in the Arrhenius plot of the diffusivity of carbon in molybdenum. They conclude that the effect may be due to a non-linear temperature variation of the elastic moduli of Mo at high temperatures. The purpose of the present note is to point out that this conclusion is subject to certain reservations. (Auth.)