Structure refinement, magnetic susceptibility, electrical conductivity and europium-151 Mössbauer spectroscopy of EuNiIn4
- 1 January 1996
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of Materials Chemistry
- Vol. 6 (5), 801-805
- https://doi.org/10.1039/jm9960600801
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, 6= 1695.88(15) pm, c= 722.32(6) pm, V= 0.5479(1) nm3, Z = 4, wR2 = 0.046l, 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)µB/Eu is close to that of the free Eu+2 ion µeff=7.947 µB. EuNiIn4 is a good metallic conductor with a specific resistivity of 14 µΩcm 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 Móssbauer 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.Keywords
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