Synthesis and structure of RE2RuMg2 (RE = Dy, Ho, Er, Tm, Lu) – i5 superstructures of the bcc packing
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Marcel Kersting
Abstract
The isotypic intermetallic compounds RE2RuMg2 (RE = Dy, Ho, Er, Tm, Lu) were synthesized from the elements in sealed niobium tubes in a muffle furnace with different annealing sequences. The polycrystalline samples were characterized through Guinier powder patterns. The structure of Er2RuMg2 was refined on the basis of single-crystal X-ray diffractometer data: ordered Os2Al3 type, I4/mmm, a = 338.44(5), c = 2029.4(4) pm, wR2 = 0.0237, 234F2 values, and 10 variables. The Er2RuMg2 structure is an i5 superstructure of the bcc packing with complete ordering of the erbium, ruthenium, and magnesium atoms. Layers of compressed, ruthenium-centered erbium cubes (290 pm Er-Ru) alternate with layers of edge-sharing magnesium tetrahedra (311 and 338 pm Mg-Mg); a new type of magnesium substructure. Temperature dependent magnetic susceptibility studies confirm the stable trivalent ground states of the rare earth elements. Lu2RuMg2 is a Pauli paramagnet and the remaining four compounds show Curie paramagnetism. Dy2RuMg2 and Ho2RuMg2 are accompanied by antiferromagnetic ordering at 8.9(1) and 3.6(1) K, respectively.
References
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Articles in the same Issue
- Inhalt
- Author Index of Volume 228 Issues 1–11
- Symmetry and the polar state of condensed molecular matter
- “Forbidden” reflections in neutron diffraction on bismuth metal oxides: symmetry reduction, λ/2 effect or Umweganregung?
- The keyite crystal structure, revisited
- Liebau density vector: a new approach to characterize lone electron pairs in mullite-type materials
- Magnesium and cadmium in covalently bonded networks: synthesis and structure of AETMg and AETCd (AE = Ca, Sr; T = Pd, Ag, Pt, Au) with TiNiSi type structure and the solid solution Yb2–xPtMgx
- Synthesis and structure of RE2RuMg2 (RE = Dy, Ho, Er, Tm, Lu) – i5 superstructures of the bcc packing
- Co4 clusters in the high-temperature phase La18Co28In3
- Crystal structures of mefloquine-oxazolidine derivatives, 4-[3-(halophenyl)hexahydro[1,3]oxazolo[3,4-a]pyridin-1-yl]- 2,8-bis(trifluoromethyl)quinolines
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