Intensity Equation for X-Rays Diffracted by One-Dimensionally Disordered Crystal of δ(Mn-Al)

概要

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δ(Mn-Al) disordered structure has a peculiar character that its second axis changes its direction according as the unit layer takes different stacking positions in the a・c-plane. In order to get an intensity expression available for this case, a little more complicated case is treated where the thicknesses of the layers are different. For this purpose, the Q matrix is conveniently modified as a product of three matrices, i.e. the one representing the phase factors corresponding to the thickness of the layer, the one representing the continuing probabilities and the one representing phase factor corresponding to the parallel displacement to a・c-plane. By the use of this Q matrix, the intensity equation is calculated. As a special case of this equation, the diffuse intensity expression for δ(Mn-Al) structure is obtained. The expression shows that there should be diffuse streaks along all the lines of hηl, with only one exception of OηO. Diffuseness and peak shift are different from line to line, since they are dependent on the indices, h and l.
社団法人日本物理学会の論文
1973-08-05