Research/Sitter/MAGNDATA / 1.1.67_NaFeGe2O6.mcif

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Spin lattice of Fe1Ge2Na1O6Spin lattice of Fe1Ge2Na1O6

Fe1Ge2Na1O6

MAGNDATA entry 1.1.67 · 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 ≤ 12 K (−261 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.
Structure · 11 properties
Magnetic groupCc1′(α,0,γ)0s
Point groupm1′
Parent space groupC 2/c No. 15
Repeats every1.48 cells along a (not a whole number: that's what incommensurate means)
Propagation[-0.677 0 0.08] 1k
Cella 9.9929 · b 8.9194 · c 5.5148 Å · α 90° · β 107.563° · γ 90°
Transition12 K (−261 °C)
Measured at2.5 K
Magnetic ionsFe
Largest moment component4.09 μB
MethodNSD and 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 Cc1′(α,0,γ)0s →
Atom sites · 10 sites · CSV
siteelementxyzmambmc|m| (μB)
Na1_1Na0.50.80040.25
Fe1_1Fe0−0.09620.25
Ge1_1Ge0.78810.59390.2299
Ge1_2Ge0.21190.59390.2701
O1_1O0.60530.58070.1303
O1_2O0.39470.58070.3697
O2_1O0.85670.77150.2995
O2_2O0.14330.77150.2005
O3_1O0.86160.5070.0147
O3_2O0.13840.5070.4853

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 (μB), as magCIF writes them. Symmetry generates the rest of the cell from these sites.

Source

G.J. Redhammer et al. Phys Chem Minerals (2011) · doi:10.1007/s00269-010-0390-3

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.67_NaFeGe2O6.mcif from MAGNDATA · entry page

sha256 of this copy: dbb58cd9919ca05432b23866d0879dd8045035e3478c7f09ee087932ee9a1c84
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.67_NaFeGe2O6.mcif.