Research/Sitter/MAGNDATA / 0.111_Co4Nb2O9.mcif

Co₄Nb₂O₉

MAGNDATA entry 0.111 · 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 ≤ 30 K (−243 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P 3′c′ 1 BNS 165.94
Point group	3′m′
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	30 K (−243 °C)
Magnetic ions	Co, Nb
Largest moment component	3 μ_B
Method	see also Journal of Magnetism and Magnetic Materials 322 (2010) L1–L3 and SCIENTIFIC REPORTS \| 4 : 3860 \| DOI: 10.1038/srep03860

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 3′c′ 1 →

Atom sites · 5 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	0	0	3	3
Co2	Co	0.3333	0.6667	0.9862	0	0	3	3
O1	O	0.2876	0	0.25
O2	O	0.0235	0.6821	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

E. Bertaut et al. J. Phys. Chem. Solids 21(1961)234. (1961) · doi:10.1016/0022-3697(61)90103-2

Cite the original paper and MAGNDATA, not this mirror.

Mirror note

re-encoded from Mac OS Roman to UTF-8. Differs from the Bilbao original.

Original file

⬇ 0.111_Co4Nb2O9.mcif from MAGNDATA · entry page

sha256 of this copy: d26e3038d61f60e3a79d810c843958d8929ae04acb42a4a50b2b5eba3c87f8bd
This copy was altered (see the mirror note above), so the original will hash differently.