Research/Sitter/MAGNDATA / 1.49_Ag2NiO2.mcif

Ag₂NiO₂

MAGNDATA entry 1.49 · 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 ≤ 56 K (−217 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	C_c 2/c BNS 15.90
Point group	2/m1′
Parent space group	C 2/m No. 12
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 2/3 1/2] 1k
Cell	a 5.0421 · b 8.7462 · c 16.3698 Å · α 90° · β 101.491° · γ 90°
Transition	56 K (−217 °C)
Measured at	5 K
Magnetic ions	Ni
Largest moment component	0.65 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 2/c →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ag1_1	Ag	0.217	0	0.3206
Ag1_2	Ag	0.717	0.1667	0.3206
Ni1_1	Ni	0	0	0	0.31	0	0.65	0.6621
Ni1_2	Ni	0.5	0.1667	0	−0.155	0	−0.325	0.331
O1_1	O	0.378	0	0.0639
O1_2	O	0.878	0.1667	0.0639

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

H. Nozaki et al. J. Phys.: Condens. Matter (2013) · doi:10.1088/0953-8984/25/28/286005

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.49_Ag2NiO2.mcif from MAGNDATA · entry page

sha256 of this copy: 4f43c8ad5de940c25fd6f06ee060cd1f4e3fa75261dcff20a9d8d711f165e676
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.49_Ag2NiO2.mcif.