Research/Sitter/MAGNDATA / 1.1.80_BiMnFe2O6.mcif

BiMnFe₂O₆

MAGNDATA entry 1.1.80 · source

incommensurate spiral

Incommensurate: the magnetic pattern repeats every so many cells, but not a whole number of them, so it never lines up with the crystal lattice. Here it's a spiral: the spin direction rotates as you move along.

ordered ≤ 220 K (−53 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P22₁2₁1′(0β0)0s0s
Point group	2221′
Parent space group	Pbcm No. 57
Repeats every	7.25 cells along b (not a whole number: that's what incommensurate means)
Propagation	[0 0.13801 0] 1k
Cell	a 5.02305 · b 7.06232 · c 12.6424 Å · α 90° · β 90° · γ 90°
Transition	220 K (−53 °C)
Measured at	7 K
Magnetic ions	Fe
Largest moment component	3.98 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 P22₁2₁1′(0β0)0s0s →

Atom sites · 12 sites · CSV

site	element	x	y	z
Bi1	Bi	0.9711	−0.1301	0.751
Fe1_1	Fe	0.486	−0.16	−0.607
Fe1_2	Fe	−0.488	0.16	0.607
Mn1_1	Mn	0.486	−0.16	−0.607
Mn1_2	Mn	−0.488	0.16	0.607
Fe2	Fe	0	0	0.5
Mn2	Mn	0	0	0.5
O1_1	O	0.157	0.439	−0.6349
O1_2	O	−0.162	−0.441	0.6386
O2_1	O	0.672	−0.408	−0.5783
O2_2	O	−0.66	−0.593	0.5746
O3_1	O	0.787	0.25	0.5

Incommensurate: the moments are modulated; the picture evaluates each atom's Fourier series at its own phase.

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

A.M. Abakumov et al. PHYSICAL REVIEW B (2011) · doi:10.1103/PhysRevB.83.214402

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.80_BiMnFe2O6.mcif from MAGNDATA · entry page

sha256 of this copy: 540c39f6749c798e6cd9092a41b655606ae9eb4510e5d096f068305a987e46ec
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.80_BiMnFe2O6.mcif.