Research/Sitter/MAGNDATA / 1.331_Li0.31Na0.69FeGe2O6.mcif

Li_0.31Na_0.69FeGe₂O₆

MAGNDATA entry 1.331 · 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 ¹2/¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 15 K (−258 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P_a 2₁/c BNS 14.80
Parent space group	P 2₁/c No. 14
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1/2 0 0] 1k
Cell	a 19.9652 · b 8.86657 · c 5.50179 Å · α 90° · β 108.286° · γ 90°
Transition	15 K (−258 °C)
Measured at	4 K
Magnetic ions	Fe
Largest moment component	3.69 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 P_a 2₁/c →

Atom sites · 11 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Na1	Na	0.1298	0.4438	0.729
Li1	Li	0.2948	0.4438	0.729
Fe1	Fe	0.1258	0.6536	0.2426	3.69	0	−0.02	3.6963
Ge1	Ge	0.02	0.3442	0.2445
Ge2	Ge	0.2702	0.843	0.2306
O1	O	0.4279	0.3358	0.1463
O2	O	0.0538	0.5229	0.2882
O3	O	0.056	0.2614	0.5478
O4	O	0.1787	0.8283	0.1226
O5	O	0.3043	0.0198	0.3175
O6	O	0.3068	0.7304	0.5058

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

G.J. Redhammer et al. Phys. Chem. Minerals (2017) · doi:10.1007/s00269-017-0892-3

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.331_Li0.31Na0.69FeGe2O6.mcif from MAGNDATA · entry page

sha256 of this copy: 6329455a0efe2d496be46fd311de117a9aeb44f668ed113df8a9efd1913d6618
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.331_Li0.31Na0.69FeGe2O6.mcif.