Abstract
The ternary stannides RE{sub 3}Ru{sub 4}Sn{sub 13} (RE = La, Ce, Pr, Nd) were obtained by arc-melting of the elements. The polycrystalline samples were characterized by powder X-ray diffraction. The structures of three compounds were refined from single-crystal diffractometer data: Yb{sub 3}Rh{sub 4}Sn{sub 13} type, Pm anti 3n, a = 977.74(3) pm, wR2 = 0.0379, 280 F{sup 2} values for La{sub 3}Ru{sub 4}Sn{sub 13}, a = 971.34(9) pm, wR2 = 0.0333, 274 F{sup 2} values for Ce{sub 3}Ru{sub 4}Sn{sub 13}, a = 970.68(8) pm, wR2 = 0.0262, 272 F{sup 2} values for Nd{sub 3}Ru{sub 4}Sn{sub 13} with 13 variables per refinement. The structures consist of three-dimensional networks of condensed RuSn{sub 6/2} trigonal prisms with the RE (CN 16) and Sn2 (CN 12) atoms in two different types of cavities of the networks. The two crystallographically independent tin sites have been resolved by {sup 119}Sn Moessbauer spectroscopy. Temperature-dependent magnetic susceptibility measurements of Ce{sub 3}Ru{sub 4}Sn{sub 13} gave a reduced magnetic moment of 2.32 {mu}{sub B} per Ce atom, indicating intermediate cerium valence. No magnetic ordering was evident down to 3 K. (orig.)
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