Year: 2024
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Ba 2 FeSbS 5 and Ba 2 FeBiS 5 are two isostructural quaternary sulfides that crystallize in the Pnma space group with four formula units per unit cell. Ba 2 FeSbS 5 has lattice parameters a = 12.08609(3) Å, b = 8.83426(2) Å, and c = 8.89114(2) Å, and Ba 2 FeBiS 5 has a = 12.09610(3) Å, b = 8.89281(2) Å, and c = 8.82437(2) Å at room temperature. They comprise infinite [FeMS 5 ] 4– (M = Sb, Bi) chains, where Fe 3+ is present in FeS 4 tetrahedra and M 3+ ions reside in edge-sharing MS 6 distorted octahedra, each of which shares an edge with an FeS 4 tetrahedron. Powder neutron diffraction measurements confirm the presence of long-range antiferromagnetic order of the Fe 3+ moments in both materials, where Fe–S···S–Fe super-superexchange interactions which act along the direction of the [FeMS 5 ] 4– (M = Sb, Bi) chains are the driving force for this antiferromagnetic order. The magnetic Bragg reflections reside on a k -vector with k = (1/2 0 1/2), and the relative orientations of the moments are similar in the two cases One significant difference is that the moments are aligned along the crystallographic b -axis in Ba 2 FeSbS 5, whereas in Ba 2 FeBiS 5 they lie along the longer crystallographic a -axis, reflecting the weak directional preference of the Fe 3+ moments. Furthermore, an additional incommensurately modulated ordering of the Fe 3+ moments is suggested for Ba 2 FeSbS 5 (but not Ba 2 FeBiS 5 ) by the appearance of small additional magnetic Bragg peaks in the neutron diffraction data, which may be a consequence of greater magnetic frustration in Ba 2 FeSbS 5 .
Source: Inorganic Chemistry
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,500
Awards: G2802484681, A SQUID Magnetometer for Quantum Materials, superconductors, molecular magnets and excited states, G3583653559, G3588806294, G4786280936, G4963570608, G5154985000, Exploiting the anion Chemistry of solids for Future Advanced Functional Materials: Core-to-Core Project on Mixed Anion Research for Energy Conversion, G875672204
OpenAlex ID: W4404691197