Research/Sitter/MAGNDATA / 0.845_SrMg2Fe16O27.mcif

Sr₁Mg₂Fe₁₆O₂₇

MAGNDATA entry 0.845 · source

s-wave ferrimagnet

Opposite moments of different size leave a net magnetisation.

Spin group ¹6/¹m¹m¹m: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 435 K (162 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	P 6₃/m m′ c′ BNS 194.270
Point group	6/mm′m′
Parent space group	P 6₃/m m c No. 194
Spins	collinear · net moment 29.2 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 5.8955 · b 5.8955 · c 32.7309 Å · α 90° · β 90° · γ 120°
Transition	435 K (162 °C)
Measured at	293 K
Magnetic ions	Fe
Largest moment component	4.7 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 6₃/m m′ c′ →

Atom sites · 21 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Sr1	Sr	0	0	0.25
Fe7PR	Fe	0.3333	0.6667	0.7454	0	0	3.6	3.6
Fe4OS	Fe	0.3333	0.6667	0.9256	0	0	3.6	3.6
Mg4OS	Mg	0.3333	0.6667	0.9256
Fe3OSS	Fe	0.5	0	0	0	0	2	2
Mg3OSS	Mg	0.5	0	0
Fe1TS	Fe	0	0	0.0557	0	0	−4.5	4.5
Mg1TS	Mg	0	0	0.0557
Fe2TS	Fe	0.3333	0.6667	0.0927	0	0	−4.2	4.2
Mg2TS	Mg	0.3333	0.6667	0.0927
Fe5ORS	Fe	0.1644	0.3288	0.6511	0	0	3.5	3.5
Mg5ORS	Mg	0.1644	0.3288	0.6511
Fe6OR	Fe	0.3333	0.6667	0.2083	0	0	−4.7	4.7
Mg6OR	Mg	0.3333	0.6667	0.2083
O1	O	0.8248	0.6496	0.0363
O2	O	0.3333	0.6667	0.0339
O3	O	0.5116	0.023	0.1108
O4	O	0	0	0.1132
O5	O	0.162	0.324	0.1801
O6	O	0.3333	0.6667	0.8184
O7	O	0.4839	0.9678	0.25

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

M. I. Morch et al. IUCrJ (2019) · doi:10.1107/S2052252519003130

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.845_SrMg2Fe16O27.mcif from MAGNDATA · entry page

sha256 of this copy: d0e96b556cd7e5c7c3e1285b72e635ef38afbbdf172074b1385b226826277801
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.845_SrMg2Fe16O27.mcif.

Sr1Mg2Fe16O27

Symmetry

Source

Original file

Sr₁Mg₂Fe₁₆O₂₇