Cd2 and Co2 dumbbell formation in the yttrium-rich intermetallic compounds Y14Ni3Cd3 and Y6Co2Zn

Theresa Block; Rainer Pöttgen

doi:10.1515/zkri-2020-0060

Published by De Gruyter (O) August 31, 2020

Cd₂ and Co₂ dumbbell formation in the yttrium-rich intermetallic compounds Y₁₄Ni₃Cd₃ and Y₆Co₂Zn

Theresa Block and Rainer Pöttgen

From the journal Zeitschrift für Kristallographie - Crystalline Materials

https://doi.org/10.1515/zkri-2020-0060

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Abstract

The yttrium-rich intermetallic compounds Y₁₄Ni₃Cd₃ and Y₆Co₂Zn were obtained by direct reactions of the elements in sealed tantalum tubes in an induction furnace. Both samples were characterized by X-ray powder diffraction and the structures were refined from single-crystal X-ray diffraction data: Lu₁₄Co₃In₃ type, P4₂/nmc, a = 960.06(5), c = 2314.9(1) pm, wR2 = 0.0669, 2034 F² values, 63 parameters for Y₁₄Ni_3.16(2)Cd_2.84(2) and Ho₆Co₂Ga type, Immm, a = 943.08(7), b = 950.08(7), c = 997.64(7) pm, wR2 = 0.0476, 981 F² values, 34 parameters for Y₆Co₂Zn. One cadmium site shows a small degree of Cd/Ni mixing, leading to the composition Y₁₄Ni_3.16(2)Cd_2.84(2). Although both compounds crystallize with significantly different structure types, they show very similar monomeric building units: (i) transition metal centered trigonal prisms of yttrium, (ii) empty Y₆ octahedra and (iii) icosahedral coordination of the cadmium respectively zinc atoms. The condensation patterns of these building units are discussed and for Y₁₄Ni_3.16(2)Cd_2.84(2), we elaborate a crystal chemical building principle along with the rare earth metal-rich phases RE₁₅Rh₅Cd₂ (La₁₅Rh₅Cd₂ type), RE₂₃T₇X₄ (Pr₂₃Ir₇Mg₄ type), RE₄TX (Gd₄RhMg type) and RE₁₀TX₃/RE₉TX₄ (ordered Co₂Al₅ versions). The structures of Y₁₄Ni₃Cd₃ and Y₆Co₂Zn show dumbbell formation: 306 pm Cd–Cd in Y₁₄Ni₃Cd₃ and 224 pm Co1–Co1 and 246 pm Co2–Co2 in Y₆Co₂Zn.

Keywords: crystal structure; metal-rich phases; rare earth intermetallics; yttrium

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

Acknowledgments

We thank Dipl.-Ing. Jutta Kösters for the collection of the single crystal diffractometer data and M. Sc. M. K. Reimann and A. Savourat for experimental help.

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Conflict of interest statements: The authors declare no conflicts of interest regarding this article.

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Received: 2020-06-22

Accepted: 2020-06-23

Published Online: 2020-08-31

Published in Print: 2020-10-25

Cd₂ and Co₂ dumbbell formation in the yttrium-rich intermetallic compounds Y₁₄Ni₃Cd₃ and Y₆Co₂Zn

Abstract

Acknowledgments

References

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