Abstract
Abstract At a 1st order transition the two phases are in equilibrium. In a solid, transition strain discontinuities induce elastic stresses which are of long range nature. In order to minimize elastic energy the interface takes definite orientations. The interface shapes, nucleation and motion have been optically observed in 3 materials : NH4C1 around the pressure induced tricritical point, quartz and deuterated KDP, with application of an electric field. In these 3 cases, observed interface orientations are in agreement with the predictions of the theory of coherent inclusions in anisotropic elastic materials.
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