Research/Sitter/MAGNDATA / 0.770_Fe2Co2Nb2O9.mcif

Fe₂Co₂Nb₂O₉

MAGNDATA entry 0.770 · 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 ≤ 58 K (−215 °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
Point group	2/m′
Parent space group	P 3 1 c No. 165
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 8.9954 · b 5.194 · c 14.1446 Å · α 90° · β 90° · γ 90°
Transition	58 K (−215 °C)
Magnetic ions	Co, Fe
Largest moment component	3.4 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 · 10 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Fe1	Fe	0.165	0.505	0.9864	2.6	0	0	2.6
Co1	Co	0.165	0.505	0.9864	2.6	0	0	2.6
Fe2	Fe	0.161	0.51	0.1935	3.4	0	0	3.4
Co2	Co	0.161	0.51	0.1935	3.4	0	0	3.4
Nb1	Nb	−0.0008	0.0067	0.1423
O1	O	0.142	0.875	0.249
O2	O	0.5	0.8	0.25
O3	O	0.159	0.179	0.083
O4	O	0.828	0.138	0.086
O5	O	0.998	0.661	0.088

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

A. Maignan et al. J. Mater. Chem. C (2021) · doi:10.1039/d1tc02950a

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.770_Fe2Co2Nb2O9.mcif from MAGNDATA · entry page

sha256 of this copy: 7ec2c44bc88851e07d78f6440a8a4949681de1d7a62afb8fabcf12a4ce285c30
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.770_Fe2Co2Nb2O9.mcif.