Research/Sitter/MAGNDATA / 1.880_Bi2MnO2F4.mcif

Bi₂Mn₁O₂F₄

MAGNDATA entry 1.880 · 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 ¹m¹m¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 19.8 K (−253 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	C_A m c a BNS 64.480
Point group	mmm1′
Parent space group	I 4/m m m No. 139
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 1/2 0] 1k
Cell	a 7.7402 · b 7.7402 · c 16.736 Å · α 90° · β 90° · γ 90°
Transition	19.8 K (−253 °C)
Measured at	5 K
Magnetic ions	Mn
Largest moment component	3.8 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_A m c a →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Bi1	Bi	0	0	0.3237
Mn1	Mn	0	0	0	0	0	3.8	3.8
F1	F	0	0.2045	0.5348
F2_1	F	0.036	0.036	0.1231
F2_2	F	0.964	0.036	0.1231
O1	O	0	0.25	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

Jonas Wolber et al. Chem. Mater. (2025) · doi:10.1021/acs.chemmater.5c01072

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.880_Bi2MnO2F4.mcif from MAGNDATA · entry page

sha256 of this copy: b134a8e1008c0018e2d64138e83dcbcce65265360f378cc409620a98e76c18fa
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.880_Bi2MnO2F4.mcif.

Bi2Mn1O2F4

Symmetry

Source

Original file

Bi₂Mn₁O₂F₄