Research/Sitter/MAGNDATA / 1.1.107_CrPO4.mcif

CrPO₄

MAGNDATA entry 1.1.107 · source

incommensurate spiral

Incommensurate: the magnetic pattern repeats every so many cells, but not a whole number of them, so it never lines up with the crystal lattice. Here it's a spiral: the spin direction rotates as you move along.

ordered ≤ 37 K (−236 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	Cm2m1′(α,0,0)000s
Point group	mm21′
Parent space group	C m c m No. 63
Repeats every	3.07 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.326 0 0] 1k
Cell	a 5.171 · b 7.7573 · c 6.1183 Å · α 90° · β 90° · γ 90°
Transition	37 K (−236 °C)
Measured at	5 K
Magnetic ions	Cr
Largest moment component	2.55 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 Cm2m1′(α,0,0)000s →

Atom sites · 7 sites · CSV

site	element	x	y	z
Cr1_1	Cr	0	0	0
P1_1	P	0	0.3503	0.25
P1_2	P	0	0.6497	0.75
O1_1	O	0	0.2459	0.0429
O1_2	O	0	0.7541	−0.0429
O2_1	O	0.2462	0.4706	0.25
O2_2	O	0.2462	0.5294	0.75

Incommensurate: the moments are modulated; the picture evaluates each atom's Fourier series at its own phase.

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. P. Attfield et al. JOURNAL OF SOLID STATE CHEMISTRY (1985) · doi:10.1016/0022-4596(85)90199-9

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.107_CrPO4.mcif from MAGNDATA · entry page

sha256 of this copy: df097d1c741f08923bc17dc8f3a5f88baa2b7b424d8ab18a9d48e875cf46962b
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.107_CrPO4.mcif.