Research/Sitter/MAGNDATA / 1.655_FeNb2O6.mcif

FeNb₂O₆

MAGNDATA entry 1.655 · 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 ¹m¹m¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered < 25 K (−248 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P_c 2₁ 2₁ 2₁ BNS 19.28
Point group	2221′
Parent space group	P b c n No. 60
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 1/2 0] 1k
Cell	a 14.263 · b 11.4636 · c 5.0378 Å · α 90° · β 90° · γ 90°
Transition	<25 K (−248 °C)
Measured at	4.2 K
Magnetic ions	Fe
Largest moment component	3.84 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_c 2₁ 2₁ 2₁ →

Atom sites · 10 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Fe1_1	Fe	0	0.0728	0.25	3.84	0	0	3.84
Fe1_2	Fe	0	0.9272	0.75	3.84	0	0	3.84
Nb1_1	Nb	0.1563	0.1656	0.7686
Nb1_2	Nb	0.8437	0.8345	0.2314
O1_1	O	0.0911	0.2004	0.418
O1_2	O	0.9089	0.7996	0.582
O2_1	O	0.0701	0.0556	0.9168
O2_2	O	0.9299	0.9445	0.0832
O3_1	O	0.2596	0.0485	0.575
O3_2	O	0.7404	0.9516	0.425

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

H. Weitzel et al. ZAAC (1971) · doi:10.1002/zaac.19713800202

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.655_FeNb2O6.mcif from MAGNDATA · entry page

sha256 of this copy: 9bce3351c8e932c325092d846197a7abc8a0ac1194b099d04701cbbdd667ecdc
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.655_FeNb2O6.mcif.