Research/Sitter/MAGNDATA / 0.215_BaNi2P2O8.mcif

BaNi₂P₂O₈

MAGNDATA entry 0.215 · 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 ¹3̄ × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 24 K (−249 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P 1′ BNS 2.6
Parent space group	R 3 No. 148
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 4.8 · b 4.8 · c 23.273 Å · α 90° · β 90° · γ 120°
Transition	24 K (−249 °C)
Measured at	4.2 K
Magnetic ions	Ni
Largest moment component	2.31 μ_B
Method	Neutron diffraction with no further specification

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 1′ →

Atom sites · 7 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ni1	Ni	0	0	0.1689	2.31	1.155	0	2.0005
P1	P	0	0	0.5734
Ba1	Ba	0	0	0
O1	O	0	0	0.638
O2_1	O	0.3424	0.3643	0.2185
O2_2	O	0.6357	0.9781	0.2185
O2_3	O	0.0219	0.6576	0.2185

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

L. Regnault et al. J. Magn. Magn. Mater. (1980) · doi:10.1016/0304-8853(80)90869-0

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.215_BaNi2P2O8.mcif from MAGNDATA · entry page

sha256 of this copy: 2a70b3f198fc061836ed09b51e7ec00abbfdaa382a94efc135b635f6e630a60b
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.215_BaNi2P2O8.mcif.