Synthesis, crystal structure, and magnetic properties of UFe5Sn

The UFe5Sn compound was synthesized by are melting, followed by annealing a t 800 degreesC. The crystal structure was determined by single-crystal X-ra y diffraction and refined to a residual value of R = 0.035 (R-w = 0.031). T his compound crystallizes in the orthorhombic CeCu5Au-type structure, space group Pnma, with lattice parameters a = 8.082(3) Angstrom, b = 4.869(1) An gstrom, and c = 10.448(3) Angstrom. Magnetization measurements were perform ed in the 5-300 K temperature range and under fields up to 5.5 T. The resul ts indicate a weak ferromagnetic behavior at room temperature. Two magnetic anomalies are observed at 248 and 180 K, respectively, and the ferromagnet ic character strongly increases below the highest temperature anomaly. (C) 2000 Academic Press.