Synthesis and magnetic properties of the extended RE
4Pd9Al24 series (RE = Sc, Y, Ce–Nd, Sm, Gd–Lu)
Author:
Radzieowski Mathis1, Bönnighausen Judith1, Janka Oliver1
Affiliation:
1. Institut für Anorganische und Analytische Chemie , Westfälische Wilhelms-Universität Münster , Corrensstrasse 30 , D-48149 Münster , Germany
Abstract
Abstract
The existing RE
4Pd9Al24 series (triclinic, space group P
1
¯
$\overline{1}$
) with RE = Gd–Tm has been extended to the rare earth elements Sc, Y, Ce–Nd, Sm, Yb and Lu. The samples were synthesized from the elements via arc-melting followed by annealing. Phase-purity was checked by powder X-ray diffraction experiments, which were also utilized to refine the lattice parameters. The structure can be described as composed of layers with a stacking of [PtAl2] (A) and [RE
2Al3] (B) slabs in an ABAAB sequence. As two different structure types (P
1
¯
$\overline{1}$
and R
3
¯
$\overline{3}$
m) have been reported for this composition, a group-subgroup scheme using the Bärnighausen formalism has been established in order to link the two. The magnetic properties of the X-ray-pure samples were investigated by susceptibility and magnetization measurements. Gd4Pd9Al24 shows the highest transition temperature to antiferromagnetism of T
N = 22.0(1) K, however, a broad feature is observed. This is in line with a low-dimensional ordering caused by the layer-like structure and the flat honeycomb arrangement of the Gd atoms.
Publisher
Walter de Gruyter GmbH
Subject
General Chemistry
Reference33 articles.
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