Research/Sitter/MAGNDATA / 1.154_NaFeSi2O6.mcif

NaFeSi₂O₆

MAGNDATA entry 1.154 · 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 ≤ 9 K (−264 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P_C 2₁/c BNS 14.84
Point group	2/m1′
Parent space group	C 2/c No. 15
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 1 0] 1k
Cell	a 9.6618 · b 8.7933 · c 5.2946 Å · α 90° · β 107.33° · γ 90°
Transition	9 K (−264 °C)
Measured at	1.5 K
Magnetic ions	Fe
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_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	0.3002	0.25
Fe1	Fe	0	0.8994	0.25	0.3	0	1.8	1.7344
Si1	Si	0.2905	0.0903	0.2379
O1	O	0.1137	0.0796	0.1384
O2	O	0.3595	0.2551	0.3041
O3	O	0.3526	0.0089	0.0105

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

Baum, M et al. PHYSICAL REVIEW B (2015) · doi:10.1103/PhysRevB.91.214415

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.154_NaFeSi2O6.mcif from MAGNDATA · entry page

sha256 of this copy: 8142a17ffb70e1e9580837e5a6d87b0afc732040d4ead97717bc40dd53742caa
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.154_NaFeSi2O6.mcif.