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The mechanism of the {\alpha}-{\epsilon} transition in iron is reconsidered.A path in the Burgers description of the bcc/hcp transition different fromthose previously considered is proposed. It relies on the assumption that shearand shuffle are decoupled and requires some peculiar magnetic order, differentfrom that of {\alpha} and {\epsilon} phases as found in Density-FunctionalTheory. Finally, we put forward an original mechanism for this transition,based on successive shuffle motion of layers, which is akin to anucleation-propagation process rather than to some uniform motion.

Mechanism for the {\alpha} -> {\epsilon} phase transition in iron