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Ferrimagnetic TiMn 1– x Os 2+ x B 2 and TiNi 1– x Os 2+ x B 2 Containing Chains of Mn 3 ‐ and Ni 3 ‐Triangles as Well as Trigonal Planar B 4 Units
Author(s) -
Scheifers Jan P.,
Küpers Michael,
Fokwa Boniface P. T.
Publication year - 2025
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.202500023
Subject(s) - ferrimagnetism , trigonal crystal system , planar , materials science , crystallography , physics , crystal structure , chemistry , computer science , magnetization , magnetic field , computer graphics (images) , quantum mechanics
The novel quaternary borides TiM 1– x Os 2+ x B 2 (MMn, Ni; x ≈ 0.3) are synthesized via arc melting and characterized using powder and single‐crystal X‐ray diffraction (XRD), energy‐dispersive X‐ray analysis, and, for the MMn phase, SQUID magnetometry. Rietveld refinement of the powder XRD data reveals the presence of Os 1– x M x as a secondary phase in both products. Single‐crystal structure refinement indicates that Os atoms occupy two distinct crystallographic sites within the structure (Ti 1+ x Os 2– x RuB 2 ‐type, space group P6 ¯ $\overset{\cdot}{6}$ 2 m , no. 189), while M (Mn, Ni) forms unprecedented chains of Mn 3 ‐ and Ni 3 ‐triangles, and boron atoms arrange into trigonal planar B 4 units. Magnetic susceptibility measurements of the MMn phase reveal a Curie temperature of ≈125 K and a negative Weiss constant of −173 K, suggestive of ferrimagnetic behavior. At low temperatures, a subtle peak in the susceptibility curve hints at a possible antiferromagnetic transition ( T N = 18 K). However, this low‐temperature magnetic ordering appears weak, as evidenced by a measurable hysteresis at 5 K with a coercivity of 36 kA m −1 , indicating mildly hard magnetic properties for this new phase.