Research/Sitter/MAGNDATA / 1.276_Na0.5Li0.5FeGe2O6.mcif

Na_0.5Li_0.5FeGe₂O₆

MAGNDATA entry 1.276 · 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 ≤ 18 K (−255 °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 19.8314 · b 8.8161 · c 5.4471 Å · α 90° · β 109.509° · γ 90°
Transition	18 K (−255 °C)
Measured at	1.5 K
Magnetic ions	Fe
Largest moment component	4.3 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)
Li1	Li	0.13	0.064	0.26
Na1	Na	0.13	0.064	0.26
Fe1	Fe	0.12	0.6525	0.23	4.3	0	0	4.3
Ge1	Ge	0.02	0.34	0.249
Ge2	Ge	0.274	0.844	0.241
O1	O	0.427	0.329	0.158
O2	O	0.052	0.519	0.285
O3	O	0.055	0.279	0.573
O4	O	0.182	0.836	0.116
O5	O	0.311	0.02	0.34
O6	O	0.309	0.71	0.494

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

T.V.Drokina et al. Journal of Magnetism and Magnetic Materials (2015) · doi:10.1016/j.jmmm.2015.03.01

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.276_Na0.5Li0.5FeGe2O6.mcif from MAGNDATA · entry page

sha256 of this copy: eeca3bfe3d3d6a3db56057ed4cbafd19a3b786315a5d93c1a825bb694d1b8676
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.276_Na0.5Li0.5FeGe2O6.mcif.