NDLI: $RE_{16}Au_{x}Al_{13−x}$ with RE = La–Nd, Sm (x ≤ 3.37): synthesis, crystal structure and physical properties of an intermetallic solid solution with barrelane analogue units

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Janka, Oliver Stegemann, Frank
Description	Author Affiliation: Stegemann F ( Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität, Corrensstrasse 30, 48149 Münster, Germany. ocjanka@uni-muenster.de.)
Abstract	During phase analytical investigations in the rare-earth element rich side of the ternary system cerium–gold–aluminum, the new ternary rare-earth (RE) gold aluminides with a composition of $RE_{16}Au_{x}Al_{13−x}$ (RE = La–Nd, Sm, x ≤ 3.37) have been synthesized first by reactive eutectics of RE/Au with Al. Single crystals of high quality can be obtained by this method. The title compounds can be selectively prepared by annealing arc-melted beads of appropriate composition below the peritectic point of the respective system. Like prototypic $La_{16}Al_{13},$ the representatives of the solid solution $RE_{16}Au_{x}Al_{13−x}$ (RE = La–Nd, Sm; x ≤ 3.37) crystallize in the hexagonal crystal system (space group P2m, a = 916.6–890.4 pm, c = 1122.4–1090.1 pm) with one formula unit per unit cell. Single crystal investigations revealed Au/Al mixing on three of the four crystallographic aluminum sites. These sites form an empty $(Au/Al)_{11}$ barrelane analogous unit, coordinated solely by the respective rare-earth atoms. In addition one independent Al site with a fivefold capped trigonal prismatic arrangement, a so called Edshammar polyhedron, exists. Magnetic measurements of $Ce_{16}Au_{3}Al_{10}$ revealed two antiferromagnetic transitions with Neél-temperatures of 7.7(1) and 2.7(1) K and a magnetic moment of $μ_{eff}$ = 2.48(1) $μ_{B},$ $Pr_{16}Au_{3}Al_{10}$ shows ferromagentic ordering with a Curie-temperature of 19.8(1) K and a magnetic moment of $μ_{eff}$ = 3.58(1) $μ_{B}.$
ISSN	14779226
Issue Number	35
Journal	Dalton Trans.
Volume Number	45
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2016-09-21
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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