Ternary Laves phases with the MgCu4Sn-type structure: RECo4Mg (RE = Gd, Dy–Tm, Lu), EuNi4Mg and RET4Cd (RE = Y, La–Nd, Sm, Gd–Dy; T = Cu, Pt)

Maximilian Kai Reimann; Michael Johnscher; Theresa Block; Judith Bönnighausen; Rainer Pöttgen

doi:10.1515/znb-2023-0055

Published by De Gruyter August 14, 2023

Ternary Laves phases with the MgCu₄Sn-type structure: RECo₄Mg (RE = Gd, Dy–Tm, Lu), EuNi₄Mg and RET₄Cd (RE = Y, La–Nd, Sm, Gd–Dy; T = Cu, Pt)

Maximilian Kai Reimann , Michael Johnscher , Theresa Block , Judith Bönnighausen and Rainer Pöttgen

From the journal Zeitschrift für Naturforschung B

https://doi.org/10.1515/znb-2023-0055

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Abstract

Twenty five new ternary Laves phases RET₄Mg and RET₄Cd (RE = rare earth element; T = Co, Ni, Cu, Pt) have been synthesized from the elements using niobium or tantalum tubes as inert crucible materials. The lattice parameters have been derived from powder X-ray diffraction data. The structures of Ce_1.41(1)Co₄Mg_0.59(1), Dy_1.10(1)Co₄Mg_0.90(1), LaPt₄Cd, Y_1.10(1)Cu₄Cd_0.90(1), Ca_0.93(1)Cd_0.07(1)Pd₂ and Eu_0.87(2)Cd_0.13(2)Pd₂ were refined from single-crystal X-ray diffractometer data. Most phases show certain degrees of RE/Mg or RE/Cd disorder. The quenched phases are assigned to the MgCu₂ structure, while the annealed ones adopt the MgCu₄Sn type, a translationengleiche superstructure variant of the aristotype. The annealing time has a substantial influence on the degree of ordering and is expressed in the lattice parameters, i.e. larger ones for the disordered samples. The REPt₄Cd (RE = La–Nd) samples have been characterized with respect to their magnetic properties. LaPt₄Cd is a diamagnet, while CePt₄Cd (2.23(1) µ_B), PrPt₄Cd (3.40(1) µ_B) and NdPt₄Cd (3.43(1) µ_B) are Curie–Weiss paramagnets. The cerium compound shows a slight moment reduction. NdPt₄Cd is ordered ferromagnetically at T_C = 4.4(1) K.

Keywords: cadmium compounds; crystal structure; Laves phases; magnesium compounds; magnetism

Corresponding author: Rainer Pöttgen, Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany, E-mail: pottgen@uni-muenster.de

Acknowledgment

We thank Dipl.-Ing. U. Ch. Rodewald and Dipl.-Ing. J. Kösters for collecting the single-crystal data, M. Sc. C. Paulsen for the EDX investigations, W. Pröbsting for experimental help and Dr. S. Klenner for early phase analytical studies in the RE-Pt-Cd systems.

Research ethics: Not applicable.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Competing interests: The authors declare no conflicts of interest regarding this article.
Research funding: This work was financed by Universität Münster.
Data availability: Data is available from the corresponding author on well-founded request.

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Received: 2023-07-24

Accepted: 2023-07-30

Published Online: 2023-08-14

Published in Print: 2023-09-26

Ternary Laves phases with the MgCu₄Sn-type structure: RECo₄Mg (RE = Gd, Dy–Tm, Lu), EuNi₄Mg and RET₄Cd (RE = Y, La–Nd, Sm, Gd–Dy; T = Cu, Pt)

Abstract

Acknowledgment

References

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