Abstract
Atomic arrangement in U 2XSi 3 with X = Pt and Fe was investigated by electron diffraction and X-ray powder diffraction and discussed in conjunction with the results of magnetic susceptibility, magnetization, specific heat electrical resistivity measurements. U 2PtSi 3 crystallizes in the simple AlB 2-type structure, where Pt and Si atoms are located at B sites disorderly and shows spin glass behavior at low temperature. Contrarily, the electron diffraction pattern for U 2FeSi 3 reveals a superstructure doubling the lattice parameter as that observed for U 2RuSi 3, suggesting absence of the random structure. In this structurally ordered compound U 2FeSi 3, no spin glass behavior is detected.
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