Structural transition and antiferromagnetic ordering in the solid solution CePd₁₋ₓAuₓAl (x = 0.1–0.9)
2020
Eustermann, Fabian | Eilers-Rethwisch, Matthias | Reimann, Maximilian K. | Janka, Oliver
The intermetallic solid solution CePd₁₋ₓAuₓAl (x = 0.1–0.9) has been synthesized from the elements by arc-melting and subsequent annealing in induction followed by tube furnaces. The samples were characterized using the Guinier powder diffraction technique and the structures of the nominal compositions CeAuAl and CePd₀.₂Au₀.₈Al were refined from single crystal X-ray diffractometer data. For small values of x = 0.1–0.3, the compounds crystallize in the hexagonal ZrNiAl-type structure (space group P6‾$‾{6}$2m), while for x = 0.5–0.9 the orthorhombic TiNiSi-type structure (space group Pnma) was observed. In both structure types, the transition metal and aluminum atoms form a complex polyanionic network with the cerium atoms filling the respective cavities. The transition metal atoms are in both cases surrounded in the shape of a tri-capped trigonal prism, the connectivity of these units, however, is different. Temperature-dependent magnetic susceptibility measurements of all compounds indicated a stable trivalent oxidation state for the cerium atoms along with antiferromagnetic ordering around TN ∼ 3 K.
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