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The influence of a temperature gradient directed perpendicular to the crystal surface on the diffraction focusing of a spherical X-ray wave in a superlattice is studied for the Laue geometry. It is shown that different satellites can be focused on the exit surface of the crystal by a smooth change in the gradient value, which can become the basis for the experimental determination of the structure factor of the superlattice.

Abstract⎯X-ray dynamic diffraction on a superlattice with a stacking fault between the layers is considered theoretically in the case of interdiffusion of superlattice components. Expressions for the X-ray reflectance within satellite limits, depending on the wave's phase jump on the stacking fault, its depth and the extent of interdiffusion of superlattice components are obtained.