Structure refinement, magnetic susceptibility, electrical conductivity and europium-151 Mössbauer spectroscopy of EuNiIn4
R. Pöttgen, R. Müllmann, B. D. Mosel and H. Eckert
Research article (journal)Abstract
The title compound was prepared by a reaction of the elemental components at 970 K in a tantalum tube. EuNiIn4, adopts the orthorhombic YNiAl4-type structure. It was refined from single-crystal X-ray data: space group Cmcm, a=447.31(4) pm, b = 1695.88(15) pm, c = 722.32(6) pm, V = 0.5479(1) nm3, Z = 4, wR2 = 0.0461, 637 F2 values and 24 variable parameters. Magnetic susceptibility measurements show Curie-Weiss behaviour above 50 K. At 16(1) K, a phase transition to the antiferromagnetic state is observed in the temperature dependence of the inverse magnetic susceptibility. The experimental magnetic moment μexp = 7.86(5) B/Eu is close to that of the free Eu2+ ion of μeff = 7.94 μB. EuNiIn4 is a good metallic conductor with a specific resistivity of 14 μ Ωcm at room temperature. 151Eu Mössbauer measurements can be fit by a single Eu site with an isomer shift δ = -10.9 mm s-1 against EuF3 which is typical for divalent Eu. At TN = 32(1) K magnetic order begins, which can be detected by Mössbauer spectroscopy when the fluctuation rate is smaller than the inverse half-life of the excited state of the 151Eu nuclide, which occurs in parts of the present sample only at temperatures significantly lower than TN.
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Authors from the University of Münster
| Eckert, Hellmut | Professorship of physical chemistry (Prof. Eckert) |
| Pöttgen, Rainer | Professorship of Inorganic Chemistry (Prof. Pöttgen) |