Research/Sitter/MAGNDATA / 0.442_Fe4Nb2O9.mcif

Fe₄Nb₂O₉

MAGNDATA entry 0.442 · source

antiferromagnet

No net magnetisation, and up and down sublattices are related by a shift or by inversion, so the bands stay spin-degenerate: a conventional antiferromagnet.

Spin group ¹2/¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 90 K (−183 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C 2/c′ BNS 15.88
Parent space group	C 2/c No. 15
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 9.0916 · b 5.1825 · c 14.1983 Å · α 90° · β 91.677° · γ 90°
Transition	90 K (−183 °C)
Measured at	10 K
Magnetic ions	Fe
Largest moment component	3.83 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	−0.0007	0	0.1421
Fe1	Fe	0.1645	0.501	0.0132	3.83	0	0	3.83
Fe2	Fe	0.1722	0.505	0.3066	3.83	0	0	3.83
O1_1	O	0.1698	0.85	0.084
O1_2	O	0.3462	0.3192	0.087
O1_3	O	0.4951	0.825	0.085
O2_1	O	0	0.72	0.25
O2_2	O	0.1365	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

R. Jana et al. PHYSICAL REVIEW B (2019) · doi:10.1103/PhysRevB.100.094109

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.442_Fe4Nb2O9.mcif from MAGNDATA · entry page

sha256 of this copy: a08c67ac0e6111d14701b14c45d8570da395e8402ecf5c3cfdf994ad611c2c00
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.442_Fe4Nb2O9.mcif.