Research/Sitter/MAGNDATA / 1.563_GeNi2O4.mcif

GeNi₂O₄

MAGNDATA entry 1.563 · 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 ≤ 11.4 K (−262 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C_c m BNS 8.35
Parent space group	F d 3 m No. 227
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 1/2 1/2] 1k
Cell	a 16.68 · b 16.68 · c 16.68 Å · α 90° · β 90° · γ 90°
Transition	11.4 K (−262 °C)
Measured at	1.5 K
Magnetic ions	Ni
Largest moment component	1.62 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_c m →

Atom sites · 11 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ge1_1	Ge	0.0625	0.0625	0.0625
Ge1_2	Ge	0.4375	0.1875	0.1875
Ni1_1	Ni	0.25	0.25	0.25	0.78	0	−0.78	1.1031
Ni1_2	Ni	0.125	0.375	0	1.62	0	−1.62	2.291
Ni1_3	Ni	0.375	0	0.125	1.62	0	−1.62	2.291
O1_1	O	0.1252	0.1252	0.1252
O1_2	O	0.2498	0.9998	0.3752
O1_3	O	0.9998	0.3752	0.2498
O1_4	O	0.5002	0.2502	0.1248
O1_5	O	0.8748	0.8748	0.8748
O1_6	O	0.2502	0.1248	0.5002

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

S. Diaz et al. PHYSICAL REVIEW B (2006) · doi:10.1103/PhysRevB.74.092404

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.563_GeNi2O4.mcif from MAGNDATA · entry page

sha256 of this copy: 4b8703be73ed4156faa2f269b3af9cce472b061023a7b4a9d3d942416a111028
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.563_GeNi2O4.mcif.