Research/Sitter/MAGNDATA / 1.260_NaMnGe2O6.mcif

NaMnGe₂O₆

MAGNDATA entry 1.260 · 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 ¹1̄ × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 7 K (−266 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P_S 1 BNS 2.7
Parent space group	C 2/c No. 15
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 1/2] 1k
Cell	a 9.851 · b 8.757 · c 11.166 Å · α 90° · β 105.51° · γ 90°
Transition	7 K (−266 °C)
Measured at	3 K
Magnetic ions	Mn
Largest moment component	1.8 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_S 1 →

Atom sites · 10 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Na1	Na	0	0.2012	0.125
Mn1	Mn	0	0.5877	0.125	0.9	0.4	1.8	1.8286
Ge1_1	Ge	0.2918	0.4095	0.1214
Ge1_2	Ge	0.7082	0.4095	0.1286
O1_1	O	0.6079	0.9196	0.0761
O1_2	O	0.3921	0.9196	0.1739
O2_1	O	0.3616	0.4879	0.0072
O2_2	O	0.6384	0.4879	0.2428
O3_1	O	0.6362	0.2243	0.095
O3_2	O	0.3638	0.2243	0.155

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

J. Cheng et al. J. Am. Chem. Soc. (2013) · doi:10.1021/ja312038g

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.260_NaMnGe2O6.mcif from MAGNDATA · entry page

sha256 of this copy: 08f9bcb4f4bcb8a4e812999fb751509659dd30f54e3cd2a9b7966a4f2ab84167
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.260_NaMnGe2O6.mcif.