Research/Sitter/MAGNDATA / 1.1.106_VPO4.mcif

VPO₄

MAGNDATA entry 1.1.106 · 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 ≤ 25.5 K (−248 °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	1.89 cells along a (not a whole number: that's what incommensurate means)
Propagation	[0.53 0 0] 1k
Cell	a 5.239 · b 7.787 · c 6.259 Å · α 90° · β 90° · γ 90°
Transition	25.5 K (−248 °C)
Measured at	13 K
Magnetic ions	V
Largest moment component	0.7 μ_B
Method	NPD and NSD

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
V1	V	0	0	0
P1_1	P	0	0.356	0.25
P1_2	P	0	0.644	0.75
O1_1	O	0.244	0.47	0.25
O1_2	O	0.244	0.53	0.75
O2_1	O	0	0.252	0.032
O2_2	O	0	0.748	−0.032

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

R. Glaum et al. JOURNAL OF SOLID STATE CHEMISTRY (1996) · doi:10.1006/jssc.1996.0303

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 1.1.106_VPO4.mcif from MAGNDATA · entry page

sha256 of this copy: cf324606a66845112c16ab9946881959dd0858c7f2dacfc173839a1a5aa3090d
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 1.1.106_VPO4.mcif.