Startseite Ternary plumbides ATPb2 (A = Ca, Sr, Ba, Eu; T = Rh, Pd, Pt) with distorted, lonsdaleite-related substructures of tetrahedrally connected lead atoms
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Ternary plumbides ATPb2 (A = Ca, Sr, Ba, Eu; T = Rh, Pd, Pt) with distorted, lonsdaleite-related substructures of tetrahedrally connected lead atoms

  • Steffen Klenner , Judith Bönnighausen und Rainer Pöttgen EMAIL logo
Veröffentlicht/Copyright: 6. Juli 2020
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Zeitschrift für Naturforschung B
Aus der Zeitschrift Zeitschrift für Naturforschung B Band 75 Heft 11

Abstract

The plumbides CaTPb2 (T = Rh, Pd), EuTPb2 (T = Rh, Pd, Pt), SrTPb2 (T = Rh, Pd, Pt) and BaTPb2 (T = Pd, Pt) were obtained by direct reactions of the elements in sealed tantalum tubes in an induction furnace. The moisture sensitive polycrystalline samples were characterized by X-ray powder diffraction. They crystallize with the orthorhombic MgCuAl2-type structure, space group Cmcm. The structures of CaRhPb2 (a = 433.78(3), b = 1102.06(8), c = 798.43(6) pm, wR = 0.0285, 432 F2 values and 16 variables) and EuPdPb2 (a = 457.24(5), b = 1158.27(13), c = 775.73(8), wR = 0.0464, 464 F2 values and 16 variables) were refined from single crystal X-ray diffractometer data. The characteristic structural motif is the distorted tetrahedral substructure built up by the lead atoms with Pb–Pb distances of 326–327 pm in CaRhPb2 and of 315–345 pm in EuPdPb2. With increasing size of the alkaline earth (Eu) cation, the lead substructure becomes more anisotropic with a shift of the [TPb2] polyanions from three- to two-dimensional, leading to significantly increased moisture sensitivity. Temperature dependent magnetic susceptibility studies reveal Pauli paramagnetism for SrRhPb2, SrPtPb2, BaPdPb2 and BaPtPb2. EuRhPb2 and EuPdPb2 are Curie–Weiss paramagnets with stable divalent europium as is also evident from 151Eu Mössbauer spectra. EuRhPb2 is a ferromagnet with TC = 17.7(2) K, while EuPdPb2 orders antiferromagnetically at TN = 15.9 K. This is in agreement with the full magnetic hyperfine field splitting of the 151Eu Mössbauer spectra at T = 6 K.

Keywords: alkaline earth; crystal structure; europium; intermetallics; magnetic properties; Mössbauer spectroscopy; plumbide
Corresponding author: Rainer Pöttgen, Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany, E-mail:

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

Acknowledgments

We thank Dipl. -Ing. J. Kösters for the intensity data collections.

  1. Author contribution: 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: 2020-04-02
Accepted: 2020-04-19
Published Online: 2020-07-06
Published in Print: 2020-11-26

© 2020 Walter de Gruyter GmbH, Berlin/Boston

Artikel in diesem Heft

  1. Frontmatter
  2. In this issue
  3. Editorial
  4. Robert Glaum zum 60. Geburtstag gewidmet
  5. Research Articles
  6. Structural transition and antiferromagnetic ordering in the solid solution CePd1−xAuxAl (x = 0.1–0.9)
  7. Ternary plumbides ATPb2 (A = Ca, Sr, Ba, Eu; T = Rh, Pd, Pt) with distorted, lonsdaleite-related substructures of tetrahedrally connected lead atoms
  8. Intergrowth of niobium tungsten oxides of the tetragonal tungsten bronze type
  9. FeBiS2Cl – A new iron-containing member of the MPnQ2X family
  10. Thallium diphosphates
  11. Behavior of beryllium halides and triflate in acetonitrile solutions
  12. Hydroflux syntheses and crystal structures of hydrogarnets Ba3[RE(OH)6]2 (RE = Sc, Y, Ho–Lu)
  13. Three of a kind? The non-isotypic triple CsCe[P2Se6], CsSm[P2Se6] and CsEr[P2Se6]
  14. The crystal structure of ZrCr2D≈4 at 50 K ≤ T ≤ 200 K
  15. High-pressure synthesis and crystal structure of HP-Al2B3O7(OH)
  16. New layered supertetrahedral compounds T2-MSiAs2, T3-MGaSiAs3 and polytypic T4-M4Ga5SiAs9 (M = Sr, Eu)
  17. Comparative photophysical study of Pt(II) complex-nanoclay hybrid materials as dry powders and hydrogels
  18. Carbon subsulfide C3S2 – synthesis by flash vacuum pyrolysis and crystal structure determination
https://doi.org/10.1515/znb-2020-0046
Schlagwörter für diesen Artikel
alkaline earth; crystal structure; europium; intermetallics; magnetic properties; Mössbauer spectroscopy; plumbide

Artikel in diesem Heft

  1. Frontmatter
  2. In this issue
  3. Editorial
  4. Robert Glaum zum 60. Geburtstag gewidmet
  5. Research Articles
  6. Structural transition and antiferromagnetic ordering in the solid solution CePd1−xAuxAl (x = 0.1–0.9)
  7. Ternary plumbides ATPb2 (A = Ca, Sr, Ba, Eu; T = Rh, Pd, Pt) with distorted, lonsdaleite-related substructures of tetrahedrally connected lead atoms
  8. Intergrowth of niobium tungsten oxides of the tetragonal tungsten bronze type
  9. FeBiS2Cl – A new iron-containing member of the MPnQ2X family
  10. Thallium diphosphates
  11. Behavior of beryllium halides and triflate in acetonitrile solutions
  12. Hydroflux syntheses and crystal structures of hydrogarnets Ba3[RE(OH)6]2 (RE = Sc, Y, Ho–Lu)
  13. Three of a kind? The non-isotypic triple CsCe[P2Se6], CsSm[P2Se6] and CsEr[P2Se6]
  14. The crystal structure of ZrCr2D≈4 at 50 K ≤ T ≤ 200 K
  15. High-pressure synthesis and crystal structure of HP-Al2B3O7(OH)
  16. New layered supertetrahedral compounds T2-MSiAs2, T3-MGaSiAs3 and polytypic T4-M4Ga5SiAs9 (M = Sr, Eu)
  17. Comparative photophysical study of Pt(II) complex-nanoclay hybrid materials as dry powders and hydrogels
  18. Carbon subsulfide C3S2 – synthesis by flash vacuum pyrolysis and crystal structure determination
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