High pressure synthesis of polar and non-polar cation-ordered polymorphs of Mn2ScSbO6.
Two new cation-ordered polymorphs of Mn2ScSbO6 have been synthesised at high-pressure. At 5.5 GPa and 1523 K Mn2ScSbO6 crystallizes in the Ni3TeO6-type structure with the polar R3 space group and cell parameters a = 5.3419 (5) Å and c = 14.0603 (2) Å. Below TC = 42.0 K it exhibits ferrimagnetic order with a net magnetization of 0.6μB arising from unusual site-selective Mn/Sc disorder and is thus a potential multiferroic material. A double perovskite phase obtained at 12 GPa and 1473 K crystallizes in the non-polar P21/n monoclinic space group with cell parameters a = 5.2909 (3) Å, b = 5.4698 (3) Å, c = 7.7349 (5) Å and β = 90.165 (6) °. Magnetization and neutron diffraction experiments reveal antiferromagnetic order below TN = 22.3 K with the spins lying in the ac plane.
Dpto. Química Inorgánica, Universidad Complutense de Madrid, Av. Complutense sn, 28040-Madrid, Spain. esolana@ucm.es.
E
E
Solana-Madruga
A J
AJ
Dos Santos-García
A M
AM
Arévalo-López
D
D
Ávila-Brande
C
C
Ritter
J P
JP
Attfield
R
R
Sáez-Puche