Research/Sitter/MAGNDATA / 0.469_TbB4.mcif

TbB₄

MAGNDATA entry 0.469 · 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 ¹m¹m¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 43 K (−230 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 10 properties

Magnetic group	P b′ a′ m′ BNS 55.359
Parent space group	P 4/m b m No. 127
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 7.12 · b 7.12 · c 4.042 Å · α 90° · β 90° · γ 90°
Transition	43 K (−230 °C)
Measured at	4.2 K
Magnetic ions	Tb
Largest moment component	7.7 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 b′ a′ m′ →

Atom sites · 5 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Tb1	Tb	0.3175	0.8175	0	0	7.7	0	7.7
B1	B	0	0	0.2017
B2	B	0.0875	0.5875	0.5
B3_1	B	0.1758	0.0387	0.5
B3_2	B	0.9613	0.1758	0.5

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

G. Will et al. Journal of the Less-Common Metals (1981) · doi:10.1016/0022-5088(81)90238-1

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.469_TbB4.mcif from MAGNDATA · entry page

sha256 of this copy: f2be75847bab1d8ae047cd80ab1aabc693d6d6f2e06ca0a5d8dd94777affbe6c
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.469_TbB4.mcif.