(Ca0.95Cd0.10)Pd2Cd3, SrPd2Cd3 and (Eu0.95Cd0.10)Pd2Cd3 with YNi2Al3 type structure – crystal chemistry and magnetic hyperfine interactions

Michael Johnscher; Birgit Gerke; Jutta Kösters; Theresa Block; Oliver Niehaus; Maximilian Kai Reimann; Rainer Pöttgen

doi:10.1515/zkri-2023-0025

Published by De Gruyter (O) July 26, 2023

(Ca_0.95Cd_0.10)Pd₂Cd₃, SrPd₂Cd₃ and (Eu_0.95Cd_0.10)Pd₂Cd₃ with YNi₂Al₃ type structure – crystal chemistry and magnetic hyperfine interactions

Michael Johnscher , Birgit Gerke , Jutta Kösters , Theresa Block , Oliver Niehaus , Maximilian Kai Reimann and Rainer Pöttgen

From the journal Zeitschrift für Kristallographie - Crystalline Materials

https://doi.org/10.1515/zkri-2023-0025

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Abstract

The intermetallic compounds (Ca_0.95Cd_0.10)Pd₂Cd₃, SrPd₂Cd₃ and (Eu_0.95Cd_0.10)Pd₂Cd₃ were synthesized from the elements in sealed niobium ampoules in an induction furnace. The polycrystalline samples were characterized through their Guinier powder patterns. The structures were refined from single crystal X-ray diffractometer data: YNi₂Al₃ type, P6/mmm, a = 984.61(5), c = 455.33(3) pm, wR2 = 0.0216, 376 F² values, 21 variables for (Ca_0.95Cd_0.10)Pd₂Cd₃, a = 998.55(8), c = 453.65(3) pm, wR2 = 0.0296, 341 F² values, 17 variables for SrPd₂Cd₃ and a = 992.57(4), c = 457.34(2) pm, wR2 = 0.0300, 384 F² values, 21 variables for (Eu_0.95Cd_0.10)Pd₂Cd₃. The striking crystal chemical motif in the three structures is a planar [PdCd₂] Kagome-type layer. The two crystallographically independent Ca (Sr, Eu) atoms have a coordination number of 18 by 6 Pd and 12 Cd atoms. The calcium and europium compound show a small degree of Ca (Eu) substitution by Cd₂ dumb-bells with 281 pm Cd–Cd in (Eu_0.95Cd_0.10)Pd₂Cd₃. Temperature dependent magnetic susceptibility measurements show Curie–Weiss behaviour (7.63(1) µ_B/Eu atom) for the europium compound and the onset of ferromagnetic ordering at T_C = 14.9(2) K. The divalent character of europium is corroborated by ¹⁵¹Eu Mössbauer spectroscpy.

Keywords: cadmium compounds; crystal structure; ferromagnetism; Kagome network; Mössbauer spectroscopy

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 for collecting the single crystal data.

Author contributions: 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: 2023-06-15

Accepted: 2023-07-13

Published Online: 2023-07-26

Published in Print: 2023-09-26

(Ca_0.95Cd_0.10)Pd₂Cd₃, SrPd₂Cd₃ and (Eu_0.95Cd_0.10)Pd₂Cd₃ with YNi₂Al₃ type structure – crystal chemistry and magnetic hyperfine interactions

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