Research/Sitter/MAGNDATA / 1.250_KNiF3.mcif

KNiF₃

MAGNDATA entry 1.250 · 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 ¹m¹3̄¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 275 K (2 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	I_c 4/m c m BNS 140.550
Parent space group	P m 3 m No. 221
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 1/2 1/2] 1k
Cell	a 8.024 · b 8.024 · c 8.024 Å · α 90° · β 90° · γ 90°
Transition	275 K (2 °C)
Measured at	4.2 K
Magnetic ions	Ni
Largest moment component	2.22 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_c 4/m c m →

Atom sites · 4 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
K1	K	0.25	0.25	0.25
Ni1	Ni	0	0	0	0	0	2.22	2.22
F1_1	F	0.25	0	0
F1_2	F	0	0	0.25

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

V. Scatturin et al. Acta Cryst. (1961) · doi:10.1107/S0365110X61000036

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.250_KNiF3.mcif from MAGNDATA · entry page

sha256 of this copy: e5415d367e809d4057b8592654ce439965810506499698a792c61b2598e8cf4d
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.250_KNiF3.mcif.