Comments on ''behaviour of inert gas bubbles under chemical concentration gradients'' by G.P. Tiwari

The motion of inert gas bubbles induced by thermal vacancy gradients has previously been used by the present authors to understand gas bubble release in UO2 and metals. This approach has been recently questioned by Tiwari, G.P. (ibid., vol.232, p.119-24, 1996). In the present letter, a critical discussion of his viewpoint is presented, together with an analysis of the important experimental results of Marachov et al. There appears to be good evidence for the disputed effect. (orig.)