Research/Sitter/MAGNDATA / 0.1143_Fe4Nb2O9.mcif

Fe₄Nb₂O₉

MAGNDATA entry 0.1143 · 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	C 2/c′ BNS 15.88
Point group	2/m′
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	4.675 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 C 2/c′ →

Atom sites · 8 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Nb1	Nb	0.001	0.9996	0.6428
Fe1	Fe	0.8341	0.4985	0.6911	3.651	−0.204	−0.863	3.776
Fe2	Fe	0.8358	0.5044	0.4852	4.675	0.484	−2.151	5.2124
O1	O	0.845	0.821	0.0863
O2	O	0.672	0.355	0.0858
O3	O	0.986	0.328	0.0833
O4	O	0	0.722	0.25
O5	O	0.141	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

⬇ 0.1143_Fe4Nb2O9.mcif from MAGNDATA · entry page

sha256 of this copy: 8b58905ef80675c2d780f176b6c251313c79e497ecf6e1b43faa2d32e3335d92
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.1143_Fe4Nb2O9.mcif.