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The germanides APtGe2 (A = Ca, Sr, Eu)

  • Steffen Klenner , Maximilian Kai Reimann and Rainer Pöttgen EMAIL logo
Published/Copyright: July 1, 2021
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Zeitschrift für Kristallographie - Crystalline Materials
From the journal Zeitschrift für Kristallographie - Crystalline Materials Volume 236 Issue 5-7

Abstract

The germanides APtGe2 (A = Ca, Sr, Eu) were synthesized from the elements in sealed tantalum ampoules in an induction furnace followed by annealing. The polycrystalline samples were characterized by powder X-ray diffraction (Guinier patterns). The structures of CaPtGe2 (CeRhSn2 type, Cmcm, a = 443.45(3), b = 1593.03(12), c = 886.15(6) pm, wR = 0.0464, 673 F2 values, 30 variables) and EuPt1.043(5)Ge1.957(5) (CeNiSi2 type, Cmcm, a = 445.23(4), b = 1752.5(2), c = 429.63(4) pm, wR = 0.0415, 389 F2 values, 19 variables) were refined from single crystal X-ray diffractometer data. One of the germanium site in EuPt1.043(5)Ge1.957(5) showed a small Ge/Pt mixed occupancy. SrPtGe2 (a = 451.13(6), b = 1764.8(2), c = 429.60(5) pm) is isotypic with EuPtGe2. The platinum atoms in both germanides have trigonal prismatic coordination: Pt@Ca4Ge2 and Pt@Eu4Ge2. The germanium substructures differ significantly: Ge2 dumb-bells with 246 and 262 pm Ge–Ge distances in CaPtGe2versus germanium zig-zag chains (253 pm Ge–Ge distances) and a distorted square net (309 pm Ge–Ge distances) in EuPtGe2. CaPtGe2 and SrPtGe2 are diamagnetic. EuPtGe2 is a Curie–Weiss paramagnet with an experimental magnetic moment of 7.88(1) µB Eu atom−1. The purely divalent character of europium is manifested by a single signal at δ = −11.38(1) mm s−1 in the 151Eu Mössbauer spectrum at 78 K. EuPtGe2 orders antiferromagnetically at TN = 5.4(1) K.

Keywords: crystal structure; germanide; magnetism; Mössbauer spectroscopy
Corresponding author: Rainer Pöttgen, Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149Münster, Germany, E-mail:

Acknowledgment

We thank Dipl.-Ing. J. Kösters for collecting the single crystal X-ray data.

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: None declared.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2021-05-04
Accepted: 2021-06-16
Published Online: 2021-07-01
Published in Print: 2021-06-25

© 2021 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/zkri-2021-2026
Keywords for this article
crystal structure; germanide; magnetism; Mössbauer spectroscopy

Articles in the same Issue

  1. Frontmatter
  2. In this issue
  3. Inorganic Crystal Structures (Original Papers)
  4. ErNi2.23Al2.77 and YbNi2.31Al2.69 – i3 superstructures of the CaCu5 type
  5. New compound Sm2Ru3Sn5 with a structure derived from Ru3Sn7
  6. Site preference and atomic ordering in the ternary Rh5Ga2As: first-principles calculations
  7. SmPt2In2 – a new ternary indide with a Pt–In polyanionic framework
  8. The order/disorder phase transition of hypophosphorous acid H3PO2
  9. KCu(SeO4)Cl(H2O)2, a first copper chloride selenate
  10. The germanides APtGe2 (A = Ca, Sr, Eu)
  11. Organic and Metalorganic Crystal Structures (Original Paper)
  12. Crystal structure analysis and supramolecular association in ethyl N-[amino(iminio)methyl]carbamate dichloride hemi-hydrate
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