Novel ternary alkaline-earth and rare-earth metal antimonides from gallium or indium flux. Synthesis, structural characterization and 121Sb and 151Eu Mössbauer spectroscopy of the series A7Ga8Sb8 (A = Sr, Ba, Eu) and Ba7In8Sb8

Svilen Bobev; Jonathan Hullmann; Thomas Harmening; Rainer Pöttgen

doi:10.1039/B920583G

Novel ternary alkaline-earth and rare-earth metal antimonides from gallium or indium flux. Synthesis, structural characterization and ¹²¹Sb and ¹⁵¹Eu Mössbauer spectroscopy of the series A₇Ga₈Sb₈ (A = Sr, Ba, Eu) and Ba₇In₈Sb₈†

Svilen Bobev,*^a Jonathan Hullmann,^a Thomas Harmening^b and Rainer Pöttgen*^b

* Corresponding authors

^a Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware, USA
E-mail: bobev@udel.edu
Fax: +1 3028316335
Tel: +1 3028318720

^b Institut für Anorganische und Analytische Chemie and NRW Graduate School of Chemistry, Universität Münster, Corrensstrasse 30, Münster, Germany
E-mail: pottgen@uni-muenster.de

Abstract

Reported are the synthesis and the structural characterization of the new ternary antimonides Eu₇Ga₈Sb₈, Sr₇Ga₈Sb₈, Ba₇Ga₈Sb₈, and Ba₇In₈Sb₈. They have been synthesized from reactions of the corresponding elements, using gallium or indium as metal fluxes. The four compounds are isostructural and crystallize with the space group P6₃/mmc (no. 194) with lattice parameters as follows: a = 4.4942(8), c = 17.274(6) Å for Eu₇Ga₈Sb₈; a = 4.5409(8), c = 17.486(4) Å for Sr₇Ga₈Sb₈; a = 4.7045(12), c = 18.123(9) Å for Ba₇Ga₈Sb₈; and a = 4.8274(3), c = 18.421(2) Å for Ba₇In₈Sb₈. The temperature dependence of the magnetic susceptibility of Eu₇Ga₈Sb₈ confirms that the Eu ions are in the typical divalent state (Eu²⁺) with a room temperature effective magnetic moment μ_eff = 8.02 μ_B. A phase transition from a paramagnetic to an antiferromagnetically ordered structure occurs in this material below 6 K. These results are corroborated by ¹⁵¹Eu Mössbauer spectroscopy at 4.2 and 78 K, respectively. Eu₇Ga₈Sb₈, Ba₇In₈Sb₈ and the previously reported Sr₇Ga₂Sb₆ derivative of the cubic Th₃P₄ type, were also investigated by ¹²¹Sb Mössbauer spectroscopy.

This article is part of the themed collection: Frontiers of synthetic solid state chemistry

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Article information

DOI: https://doi.org/10.1039/B920583G
Article type: Paper
Submitted: 02 Oct 2009
Accepted: 27 Nov 2009
First published: 14 Jan 2010

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Dalton Trans., 2010,39, 6049-6055

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Novel ternary alkaline-earth and rare-earth metal antimonides from gallium or indium flux. Synthesis, structural characterization and ¹²¹Sb and ¹⁵¹Eu Mössbauer spectroscopy of the series A₇Ga₈Sb₈ (A = Sr, Ba, Eu) and Ba₇In₈Sb₈

S. Bobev, J. Hullmann, T. Harmening and R. Pöttgen, Dalton Trans., 2010, 39, 6049 DOI: 10.1039/B920583G

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