The compound NdAlSi was studied using X-ray powder diffraction technique and refined by the Rietveld method. The compound NdAlSi has tetragonal α-ThSi2-type structure, space group I41/amd (No.141), Z = 4, and the lattice parameters a = 0.41991(1) nm, c = 1.44916(3) nm. The Smith and Snyder figure of merit FN is F30 = 103.1(36). The R-factors of Rietveld refinement are Rp = 0.113 and Rwp = 0.148, respectively. The X-ray powder diffraction data is pre-sented in this article.
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