Abstract
X-ray and neutron diffraction measurements have been performed to elucidate the structure for amorphous (a-)TbNi 2D 2.4 prepared by deuterium absorption of the C15 Laves phase compound TbNi 2. The results were compared with those for previously reported a-TbFe 2D 3.0 which shows the concentration fluctuations. Noticeable differences in the arrangements of metal atoms and the occupation sites of D atoms between the two samples were observed in both X-ray and neutron diffraction data. Namely, in distinction from a-TbFe 2D 3.0, the atomic arrangement of a-TbNi 2D 2.4 is relatively homogeneous. Three-dimensional atomic arrangements obtained from the reverse Monte Carlo (RMC) modeling provided us the visual description of the differences in the structures between a-TbNi 2D 2.4 and a-TbFe 2D 3.0. It was found that over 40% of the D atoms occupied 2Ni + 2Tb tetrahedral sites in a-TbNi 2D 2.4.
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