Research/Sitter/MAGNDATA / 0.196_Co4Nb2O9.mcif

Co₄Nb₂O₉

MAGNDATA entry 0.196 · 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 ¹3̄¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 27.2 K (−246 °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	P 3c 1 No. 165
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 5.1736 · b 5.1736 · c 14.1457 Å · α 90° · β 90° · γ 120°
Transition	27.2 K (−246 °C)
Measured at	10 K
Magnetic ions	Co
Largest moment component	3.7 μ_B
Method	NSD

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	0	0.1421
Co1	Co	0.3333	0.6667	0.193	3.7	1.85	1.42	3.5048
Co2	Co	0.3333	0.6667	0.9862	2.78	1.39	0.97	2.5956
O1_1	O	0.2876	0	0.25
O1_2	O	0	0.2876	0.25
O2_1	O	0.0235	0.6821	0.0847
O2_2	O	0.3179	0.3414	0.0847
O2_3	O	0.6586	0.9765	0.0847

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

N.D. Khanh et al. Phys. Rev. B (2018) · doi:10.1103/PhysRevB.93.075117

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.196_Co4Nb2O9.mcif from MAGNDATA · entry page

sha256 of this copy: a87051db94d7e15f874c9e42d5919a4b73b857f1456d5f82b1c2e511c24b7da1
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.196_Co4Nb2O9.mcif.