Research/Sitter/MAGNDATA / 1.646_Na2Ni2TeO6.mcif

Na₂Ni₂TeO₆

MAGNDATA entry 1.646 · 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 ≤ 30 K (−243 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	I_a m m 2 BNS 44.234
Point group	mm21′
Parent space group	P 6₃/m c m No. 193
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 0 1/2] 1k
Cell	a 10.3828 · b 5.19141 · c 22.182 Å · α 90° · β 90° · γ 120°
Transition	30 K (−243 °C)
Measured at	4 K
Magnetic ions	Ni
Largest moment component	1.55 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 I_a m m 2 →

Atom sites · 12 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Te1	Te	0	0	0
Ni1	Ni	0.1667	0.6667	0	0	0	1.55	1.55
O1_1	O	0.1636	0	0.2964
O1_2	O	0	0.3271	0.2964
O1_3	O	0.8365	0	0.5464
O1_4	O	0	0.6729	0.5464
Na1_1	Na	0.1747	0	0.125
Na1_2	Na	0	0.3495	0.125
Na1_3	Na	0.8253	0	0.375
Na1_4	Na	0	0.6505	0.375
Na2_1	Na	0.1667	0.6667	0.125
Na2_2	Na	0.3333	0.3333	0.375

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. M. Samarakoon et al. Phys. Rev. B (2021) · doi:10.1103/PhysRevB.104.184415

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.646_Na2Ni2TeO6.mcif from MAGNDATA · entry page

sha256 of this copy: 0d030105839dd74840e3899cc53e29fb961e4238653d10e31d88f3635df6a380
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.646_Na2Ni2TeO6.mcif.