Research/Sitter/MAGNDATA / 1.528_Bi2Fe4O9.mcif

Bi₂Fe₄O₉

MAGNDATA entry 1.528 · 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 ≤ 244 K (−29 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	C_a 2/m BNS 12.64
Parent space group	P b a m No. 55
Spins	coplanar · net moment 0 μ_B per cell
Propagation	[1/2 1/2 1/2] 1k
Cell	a 15.9486 · b 16.894 · c 12.0135 Å · α 90° · β 90° · γ 90°
Transition	244 K (−29 °C)
Measured at	15 K
Magnetic ions	Fe
Largest moment component	3.6 μ_B
Method	NSD

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 2/m →

Atom sites · 14 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Fe1_1	Fe	0.1785	0.1704	0.25	−0.62	3.47	0	3.525
Fe1_2	Fe	0.0714	0.4204	0.25	3.47	0.62	0	3.525
Fe2_1	Fe	0	0.25	0.3686	−0.99	−3.6	0	3.7336
Fe2_2	Fe	0.25	0	0.6314	−3.6	0.99	0	3.7336
Bi1_1	Bi	0.088	0.088	0
Bi1_2	Bi	0.162	0.338	0
O1_1	O	0	0	0.25
O1_2	O	0.25	0.25	0.25
O2_1	O	0.1867	0.1093	0.1221
O2_2	O	0.0633	0.3593	0.8779
O3_1	O	0.0687	0.2014	0.25
O3_2	O	0.1813	0.4515	0.25
O4_1	O	0.0839	0.2238	0
O4_2	O	0.1661	0.4738	0

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

E. Ressouche et al. PHYSICAL REVIEW LETTERS (2009) · doi:10.1103/PhysRevLett.103.267204

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.528_Bi2Fe4O9.mcif from MAGNDATA · entry page

sha256 of this copy: 2bda05179874bd6efc4e9f0698604260c5b0ff60137740e41b4f78fd9f99dc9e
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.528_Bi2Fe4O9.mcif.