Ferrimagnetic TiMn1–xOs2+xB2 and TiNi1–xOs2+xB2 Containing Chains of Mn3‐ and Ni3‐Triangles as Well as Trigonal Planar B4 Units
Year: 2025
Type: article
Abstract: The novel quaternary borides TiM1–xOs2+xB2 (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 Os1–xMx as a secondary phase in both products. Single‐crystal structure refinement indicates that Os atoms occupy two distinct crystallographic sites within the structure (Ti1+xOs2–xRuB2‐type, space group P2m, no. 189), while M (Mn, Ni) forms unprecedented chains of Mn3‐ and Ni3‐triangles, and boron atoms arrange into trigonal planar B4 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 (TN = 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.
Institutions: University of California, Riverside, RWTH Aachen University
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W4408992237