Research/Sitter/MAGNDATA / 0.734_Mn3Ta2O8.mcif

Mn₃Ta₂O₈

MAGNDATA entry 0.734 · 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 ¹4/¹m × ²1: each symmetry marked ¹ keeps every spin, ² swaps up and down.

ordered ≤ 23 K (−250 °C)Colour: where that sits relative to 25 °C. Saturation: how much margin it has.

Structure · 11 properties

Magnetic group	C 2′/c BNS 15.87
Point group	2′/m
Parent space group	I 4₁/a No. 88
Spins	collinear · net moment 0 μ_B per cell
Propagation	[0 0 0] 1k
Cell	a 11.2728 · b 11.2728 · c 9.803 Å · α 90° · β 90° · γ 90°
Transition	23 K (−250 °C)
Measured at	10 K
Magnetic ions	Mn
Largest moment component	4.01 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 C 2′/c →

Atom sites · 14 sites · CSV

site	element	x	y	z	m_a	m_b	m_c	\|m\| (μ_B)
Ta1_1	Ta	0.4218	0.056	0.1299
Ta1_2	Ta	0.194	0.1718	0.8799
Mn1_1	Mn	0.8794	0.5488	0.099	0	−4.01	0	4.01
Mn1_2	Mn	0.7012	0.6294	0.849	0	4.01	0	4.01
Mn2	Mn	0	0.75	0.875	0	4.01	0	4.01
Mn3	Mn	0	0.75	0.375	0	4.01	0	4.01
O1_1	O	0.3718	0.2016	0.2101
O1_2	O	0.0484	0.1218	−0.0399
O2_1	O	0.4633	0.8965	0.0187
O2_2	O	0.3535	0.2133	0.7687
O3_1	O	0.1973	0.308	−0.0004
O3_2	O	0.442	0.4473	0.2496
O4_1	O	0.3168	−0.0374	0.2423
O4_2	O	0.2874	0.0668	−0.0077

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. Grins et al. J. Mater. Chem. (1999) · doi:10.1039/A902149C

Cite the original paper and MAGNDATA, not this mirror.

Original file

⬇ 0.734_Mn3Ta2O8.mcif from MAGNDATA · entry page

sha256 of this copy: 89f29c2186416475f6cbfb4666c47db009d9174f3eea1b0b15c8e767d5412ace
The mirror keeps the bytes Bilbao served, so the original should hash the same unless MAGNDATA has revised the entry since: shasum -a 256 0.734_Mn3Ta2O8.mcif.