Journal
INORGANIC CHEMISTRY
Volume 57, Issue 10, Pages 5820-5829Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.8b00208
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Funding
- German Research Foundation (Deutsche Forschungsgemeinschaft, DFG) [HL 62/3-1]
- German Academic Exchange Service (Deutscher Akademischer Austauschdienst, DAAD) [A/12/85156]
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The crystal structure of CaFe4Al8 was studied by X-ray single crystal and powder diffraction as well as high-resolution neutron powder diffraction. CaFe4Al8 crystallizes with a tetragonal CeMn4Al8-type structure, an ordered variant of the ThMn12-type (Pearson symbol tI26, space group I4/mmm, a = 8.777(1), c = 5.077(1) angstrom). Similarly to the well-known A15-type superconductors, the structure of CaFe4Al8 contains one-dimensional chains of d-metal atoms, which are parallel to the crystallographic fourfold axis. CaFe4Al8 is paramagnetic at room temperature and exhibits long-range antiferromagnetic ordering at about 180 K, combined with a short-range ordered spin arrangement. The magnetic structure, determined by powder neutron diffraction at 4 K, shows that the magnetic moments on the Fe atoms form mirror-inverted chains along the c-direction and are slightly canted from the axis.
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