Research/Sitter/MAGNDATA / 1.204_Ni2SiO4.mcif

Ni₂SiO₄

MAGNDATA entry 1.204 · source

noncollinear antiferromagnet

All moments add up to a net magnetisation: an ordinary magnet. Spin splitting is the same in every direction (s-wave).

ordered ≤ 34 K (−239 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P_c 2₁/c BNS 14.82
Parent space group	P n m a No. 62
Spins	coplanar · net moment 0 μ_B per cell
Propagation	[1/2 0 1/2] 1k
Cell	a 20.2287 · b 5.912301 · c 9.45808 Å · α 90° · β 90° · γ 90°
Transition	34 K (−239 °C)
Measured at	2 K
Magnetic ions	Ni
Largest moment component	1.95 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 P_c 2₁/c →

Atom sites · 12 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ni1_1	Ni	0	0	0	1.82	0	−0.9	2.0304
Ni1_2	Ni	0.25	0	0.25	−1.82	0	0.9	2.0304
Ni2_1	Ni	0.137	0.25	0.4956	−0.73	0	1.95	2.0822
Ni2_2	Ni	0.113	0.75	0.7456	0.73	0	−1.95	2.0822
Si1_1	Si	0.0471	0.25	0.2135
Si1_2	Si	0.2029	0.75	0.4636
O1_1	O	0.0466	0.25	0.3847
O1_2	O	0.2034	0.75	0.6347
O2_1	O	0.2226	0.25	0.1086
O2_2	O	0.0274	0.75	0.3586
O3_1	O	0.0816	0.0301	0.1372
O3_2	O	0.1684	0.9699	0.3872

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

R.H. Colman et al. Journal of Physics: Conference Series (2009) · doi:10.1088/1742-6596/145/1/012037

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.204_Ni2SiO4.mcif from MAGNDATA · entry page

sha256 of this copy: 88fe42bc3f2a6b11b404e6797d6070ca07c5bd86a55ac69bf8a67720bc2b4ab5
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.204_Ni2SiO4.mcif.