X‐Ray Spectroscopy Study of RMn<sub>2</sub>Si<sub>2</sub> Intermetallics

Prabhawalkar, V.; Padalia, B. D.

doi:10.1002/pssb.2221210161

Cited by 2 publications

(1 citation statement)

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“…Rare earth ( RE ) based intermetallic compounds have remarkably diverse crystal structures as well as magnetic and electronic properties. − Among them europium is special because it can adopt different oxidation states, (i) divalent magnetic (Eu 2+ ), − (ii) trivalent nonmagnetic (Eu 3+ ) and/or (iii) even the mixed-valent state. ,− Generally, such intermetallic compounds are prepared by arc-melting techniques, but because europium is volatile at high temperatures (boiling point 1597 °C) it is difficult to use this technique for their synthesis. The metal flux technique is an excellent tool for exploring novel intermetallic compounds. − In comparison to many other metal fluxes, indium is remarkably good in dissolving Si, Ge, rare earth elements, and transition metals and can yield well shaped crystals of new materials.…”

Section: Introductionmentioning

confidence: 99%

Indium Flux-Growth of Eu₂AuGe₃: A New Germanide with an AlB₂ Superstructure

et al. 2010

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The germanide Eu(2)AuGe(3) was obtained as large single crystals in high yield from a reaction of the elements in liquid indium. At room temperature Eu(2)AuGe(3) crystallizes with the Ca(2)AgSi(3) type, space group Fmmm, an ordered variant of the AlB(2) type: a = 857.7(4), b = 1485.5(10), c = 900.2(4) pm. The gold and germanium atoms build up slightly distorted graphite-like layers which consist of Ge(6) and Au(2)Ge(4) hexagons, leading to two different hexagonal-prismatic coordination environments for the europium atoms. Magnetic susceptibility data showed Curie-Weiss law behavior above 50 K and antiferromagnetic ordering at 11 K. The experimentally measured magnetic moment indicates divalent europium. The compound exhibits a distinct magnetic anisotropy based on single crystal measurements and at 5 K it shows a metamagnetic transition at ∼10 kOe. Electrical conductivity measurements show metallic behavior. The structural transition at 130 K observed in the single crystal data was very well supported by the conductivity measurements. (151)Eu Mössbauer spectroscopic data show an isomer shift of -11.24 mm/s at 77 K, supporting the divalent character of europium. In the magnetically ordered regime one observes superposition of two signals with hyperfine fields of 26.0 (89%) and 3.5 (11%) T, respectively, indicating differently ordered domains.

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