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Rational Synthetic Tuning between Itinerant Antiferromagnetism and Ferromagnetism in the Complex Boride Series Sc 2 FeRu 5− n Rh n B 2 (0≤ n ≤5)
Author(s) -
Fokwa Boniface P. T.,
Lueken Heiko,
Dronskowski Richard
Publication year - 2007
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200700128
Subject(s) - antiferromagnetism , crystallography , boride , ferromagnetism , magnetism , tetragonal crystal system , valence electron , valence (chemistry) , crystal structure , chemistry , magnetic susceptibility , materials science , electron , condensed matter physics , inorganic chemistry , physics , organic chemistry , quantum mechanics
Single crystals of the complex boride series Sc 2 FeRu 5− n Rh n B 2 ( n =1, 3, 4) were synthesized by arc‐melting the elements in water‐cooled copper crucibles under argon atmospheres and were chemically characterized by single‐crystal XRD and EDX analyses. The new compounds are isotypic and crystallize in the tetragonal space group P 4/ mbm with Z =2, adopting a substitutional variant of the Ti 3 Co 5 B 2 ‐type structure. The magnetically active iron atoms are arranged in chains with intra‐ and interchain distances of about 3.02 and 6.60 Å, respectively. Strong ferromagnetic interactions are observed for both Sc 2 FeRuRh 4 B 2 (64 valence electrons (VE), T C ≈350 K, μ a =3.1 μ B ) and Sc 2 FeRu 2 Rh 3 B 2 (63 VE, T C ≈300 K, μ a =3.0 μ B ), whereas antiferromagnetic interactions are found in the case of Sc 2 FeRu 4 RhB 2 (61 VE, T N ≈10 K, μ eff =3.2): The magnetism of the entire Sc 2 FeRu 5− n Rh n B 2 (0≤ n ≤5) series is discussed based on the variable valence‐electron count and the resulting Fe–Fe bonding character, and it is also compared with other isoelectronic systems.