Research/Sitter/MAGNDATA / 0.1144_Fe4Nb2O9.mcif

Fe₄Nb₂O₉

MAGNDATA entry 0.1144 · source

noncoplanar magnet

Spins pointing in three dimensions, not confined to a plane.

ordered ≤ 87.5 K (−186 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P 1′ BNS 2.6
Point group	1′
Parent space group	C 2/c No. 15
Spins	noncoplanar · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 9.0861 · b 5.197 · c 14.234 Å · α 90° · β 91.29° · γ 90°
Transition	87.5 K (−186 °C)
Measured at	1.5 K
Magnetic ions	Fe
Largest moment component	5.43 μ_B
Method	NPD

Symmetry

Stereogram of the magnetic point group: each operation applied to one direction. Filled = upper hemisphere, ring = lower; red operations include time reversal. Lines are mirrors; polygons are 2/3/4/6-fold axes; the centre ring is inversion.

Every structure in P 1′ →

Atom sites · 15 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Nb1_1	Nb	0.001	0.9996	0.6428
Nb1_2	Nb	0.999	0.9996	0.8572
Fe1_1	Fe	0.832	0.4948	0.6887	3.57	1.1	−0.86	3.8513
Fe1_2	Fe	0.1706	0.5028	0.807	−3.21	−1.1	1.48	3.7307
Fe2_1	Fe	0.8337	0.4915	0.484	4.37	0	−1.94	4.821
Fe2_2	Fe	0.1647	0.5094	0.0143	−5.43	0	1.87	5.7826
O1_1	O	0.845	0.821	0.0863
O1_2	O	0.155	0.821	0.4137
O2_1	O	0.672	0.355	0.0858
O2_2	O	0.328	0.355	0.4142
O3_1	O	0.986	0.328	0.0833
O3_2	O	0.014	0.328	0.4167
O4	O	0	0.722	0.25
O5_1	O	0.141	0.145	0.25
O5_2	O	0.859	0.145	0.25

Moment components are along the crystal axes a, b, c (μ_B), as magCIF writes them. Symmetry generates the rest of the cell from these sites.

Source

Raktim Datta et al. PHYSICAL REVIEW B (2025) · doi:10.1103/9tgw-l1nj

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.1144_Fe4Nb2O9.mcif from MAGNDATA · entry page

sha256 of this copy: 498cbabc7ded22167403fda11e8a8f6da2dd486c6177450a274b8f68736659b5
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.1144_Fe4Nb2O9.mcif.