Structural transition and antiferromagnetic ordering in the solid solution CePd1−xAuxAl (x = 0.1–0.9)

Fabian Eustermann; Matthias Eilers-Rethwisch; Maximilian K. Reimann; Oliver Janka

doi:10.1515/znb-2020-0025

Published by De Gruyter October 30, 2020

Structural transition and antiferromagnetic ordering in the solid solution CePd_1−xAu_xAl (x = 0.1–0.9)

Fabian Eustermann , Matthias Eilers-Rethwisch , Maximilian K. Reimann and Oliver Janka

From the journal Zeitschrift für Naturforschung B

https://doi.org/10.1515/znb-2020-0025

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Abstract

The intermetallic solid solution CePd_1−xAu_xAl (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 CePd_0.2Au_0.8Al 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‾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 T_N ∼ 3 K.

Keywords: aluminum; cerium; gold; intermetallics; magnetic properties; palladium

Dedicated to: Professor Robert Glaum on the occasion of his 60th birthday.

Corresponding author: Oliver Janka, Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149Münster, Germany; and Universität des Saarlandes, Anorganische Festkörperchemie, Campus C4 1, 66123Saarbrücken, Germany, E-mail: oliver.janka@uni-saarland.de

Acknowledgments

We thank Dipl.-Ing. Ute Ch. Rodewald and Dr. R.-D. Hoffmann for the single crystal intensity data collections.

Author contribution: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2020-02-03

Accepted: 2020-03-31

Published Online: 2020-10-30

Published in Print: 2020-11-26

Structural transition and antiferromagnetic ordering in the solid solution CePd_1−xAu_xAl (x = 0.1–0.9)

Abstract

Acknowledgments

References

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