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Crystal Structure of the Ternary Arsenide CeNi1.91As1.94

  • V. Babizhetskyy , E. Le Für , J. Y. Pivan and R. Guérin EMAIL logo
Published/Copyright: June 2, 2014
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Zeitschrift für Naturforschung B
From the journal Zeitschrift für Naturforschung B Volume 57 Issue 12

A new ternary intermetallic has been obtained in the Ce-Ni-As system, the composition of which is CeNi1.91As1.94 from X-ray single crystal structure determination. The structure is derived from the CaBe2Ge2 type with the following relations between the vectors a, b, and c of the cell and a0, b0, and c0 of the subcell: a = 2a0 - 2b0; b = 2a0 + 2b0 and c = 2c0 (V = 16 V0). The structure takes its origin from compositional and displacive mechanisms. The major structural modifications occur in the nickel-arsenic layers (two per cell) where the nickel atoms are in “square” pyramidal As sites. Moreover, the slight atomic displacements in these layers that develop in the ab plane, lead to As8 clusters, each formed by a central part As4 linked by four apical As ligands. These clusters constrain arsenic to adopt a valence state higher than -3 which in turn involves the lowering of the counterbalancing charge from the nickel substructure. The structure of CeNi1.91As1.94 is compared in details with that of the previously reported URh1.6As1.9.

Keywords: Ternary Defective Arsenide; Supercell; CaBe2Ge2-Type; Arsenic Clusters
Received: 2002-5-7
Published Online: 2014-6-2
Published in Print: 2002-12-1

© 1946 – 2014: Verlag der Zeitschrift für Naturforschung

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https://doi.org/10.1515/znb-2002-1204
Keywords for this article
Ternary Defective Arsenide; Supercell; CaBe2Ge2-Type; Arsenic Clusters

Articles in the same Issue

  1. Zur Kenntnis von Calciumtetrahydrogen-hexaoxo-diperiodattetrahydrat CaH4I2O10 · 4 H2O: Kristallstruktur, Schwingungsspektren und thermische Analyse / On Calciumtetrahydrogen-hexaoxo-diperiodatetetrahydrate CaH4I2O10 · 4 H2O: Crystal Structure, Vibrational Spectroscopy and Thermal Analysis
  2. Mg5Pd10Si16 und Mg5Pt10Si16, Magnesium-Platinmetall-Silicide mit Tetraedern und gekappten Tetraedern aus Silicium-Atomen / Mg5Pd10Si16 and Mg5Pt10Si16, Magnesium Platinum Metal Silicides with Si4 Tetrahedra and Si12 Truncated Tetrahedra
  3. Synthesis and Crystal Structure of Zr5Rh2In4 and Hf5Rh2In4 – New Ternary Indides with Lu5Ni2In4 Type Structure
  4. Crystal Structure of the Ternary Arsenide CeNi1.91As1.94
  5. Kristallstrukturen und elektronische Eigenschaften von Ge1/3NbS2 und Ge1/4NbS2 / Crystal Structures and Electronic Properties of Ge1/3NbS2 and Ge1/4NbS2
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  7. Reactions in Molten Alkalimetal Polychalcogenides: What Happens in the Melt? A Study of the Reactions in the System K-Nb-S Using Differential Scanning Calorimetry, Infrared Spectroscopy, and X-Ray Powder Diffraction
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  19. Synthesis and Characterisation of Na5[CoO2]CO3
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