Research/Sitter/MAGNDATA / 1.314_NaFeSi2O6.mcif

NaFeSi₂O₆

MAGNDATA entry 1.314 · 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 ≤ 8 K (−265 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P_C 2₁/c BNS 14.84
Parent space group	C 2/c No. 15
Spins	collinear · net moment 0 μ_B per cell
Propagation	[1 0 0] 1k
Cell	a 9.6478 · b 8.7953 · c 5.2809 Å · α 90° · β 107.32° · γ 90°
Transition	8 K (−265 °C)
Measured at	5 K
Magnetic ions	Fe
Largest moment component	2.46 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_C 2₁/c →

Atom sites · 6 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Na1	Na	0	0.3015	0.25
Fe1	Fe	0	0.8991	0.25	1.01	0	2.46	2.3648
Si1	Si	0.2894	0.09	0.2343
O1	O	0.1139	0.0788	0.1376
O2	O	0.3599	0.2579	0.3009
O3	O	0.353	0.0085	0.0112

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 (2011) · doi:10.1007/s00269-010-0390-3

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.314_NaFeSi2O6.mcif from MAGNDATA · entry page

sha256 of this copy: 6bb84b6ea31350b05386402b103f3f0fcc8510f949e8deed248fd6ee4a85cffe
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.314_NaFeSi2O6.mcif.