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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences


IMPACT FACTOR 2018: 0.961

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1865-7117
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Volume 73, Issue 11

Issues

Two series of rare earth metal-rich ternary aluminium transition metallides – RE6Co2Al (RE=Sc, Y, Nd, Sm, Gd–Tm, Lu) and RE6Ni2.25Al0.75 (RE=Y, Gd–Tm, Lu)

Frank Stegemann
  • Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 30, 48149 Münster, Germany
  • Other articles by this author:
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/ Oliver Janka
  • Corresponding author
  • Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 30, 48149 Münster, Germany
  • Institut für Chemie, Carl von Ossietzky Universität Oldenburg, Carl-von-Ossietzky Strasse 9–11, 26129 Oldenburg, Germany
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Published Online: 2018-09-27 | DOI: https://doi.org/10.1515/znb-2018-0153

Abstract

The rare earth metal-rich cobalt and nickel aluminium compounds with the general compositions RE6Co2Al (RE=Sc, Y, Nd, Sm, Gd–Tm, Lu) and RE6Ni2.25Al0.75 (RE=Y, Gd–Tm, Lu) have been synthesised from the elements by arc-melting, followed by annealing. Single-crystal X-ray diffraction experiments on Y6Co2.02(1)Al0.98(1) (Ho6Co2Ga type; Immm; a=944.1(2), b=952.4(2), c=999.0(2) pm; wR2=0.0452, 1123 F2 values, 35 variables) and Y6Ni2.26(1)Al0.74(1) (Ho6Co2Ga type; Immm; a=938.30(5), b=959.45(5), c=996.05(6) pm; wR2=0.0499, 1131 F2 values, 35 variables) revealed that the compounds form solid solutions according to the general formula RE6(Co/Ni)2+xAl1−x with different homogeneity ranges. The compounds of the Ni series can be obtained in X-ray pure form only with the nominal composition RE6Ni2.25Al0.75. A significant increase of the U22 component of the anisotropic displacement parameters of the Co/Ni2 atoms (4g site) was observed that requires a description of the structure with a split-position model at RT. Further investigations by low temperature (90 K) single-crystal X-ray diffraction experiments of Y6Co2.02(1)Al0.98(1) showed a significant decrease of U22. Magnetic measurements were conducted on the X-ray pure members of the RE6Co2Al (RE=Y, Dy–Tm, Lu) series. Antiferromagnetic ordering was observed for the members with unpaired f electrons with Néel temperatures up to TN=48.0(1) K and two spin reorientations for Dy6Co2Al.

Keywords: aluminium; cobalt; intermetallics; nickel; physical properties; rare earth metals

Dedicated to: Professor Werner Uhl on the occasion of his 65th birthday.

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About the article

Received: 2018-07-26

Accepted: 2018-09-04

Published Online: 2018-09-27

Published in Print: 2018-11-27


Citation Information: Zeitschrift für Naturforschung B, Volume 73, Issue 11, Pages 927–942, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.1515/znb-2018-0153.

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