Research/Sitter/MAGNDATA / 1.144_NH4FeCl2(HCOO).mcif

NH₄FeCl₂(HCOO)

MAGNDATA entry 1.144 · 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 ≤ 6 K (−267 °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	[1 0 0] 1k
Cell	a 7.888 · b 11.156 · c 6.92 Å · α 90° · β 108.07° · γ 90°
Transition	6 K (−267 °C)
Measured at	4 K
Magnetic ions	Fe
Largest moment component	2.64 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 · 8 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Fe1	Fe	0	0	0	2.64	0	−2.15	3.8876
Cl1	Cl	0.7695	0.0466	0.1685
N1	N	0	0.3293	0.25
O1	O	0.0065	0.8217	0.0895
C1	C	0	0.7709	0.25
H1	H	0	0.686	0.25
H2	H	0.404	0.8742	0.231
H3	H	0.488	0.7845	0.139

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.T. Greenfield et al. J. Solid State Chem. (2016) · doi:10.1016/j.jssc.2015.09.016

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.144_NH4FeCl2(HCOO).mcif from MAGNDATA · entry page

sha256 of this copy: 89dfed8a62eaae046a0ac9b476572f157377ba6ed1212746b48982a346a9f4ad
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.144_NH4FeCl2(HCOO).mcif.