High pressure synthesis of polar and non-polar cation-ordered polymorphs of Mn sub(2)ScSbO sub(6)

Two new cation-ordered polymorphs of Mn sub(2)ScSbO sub(6) have been synthesised at high-pressure. At 5.5 GPa and 1523 K Mn sub(2)ScSbO sub(6) crystallizes in the Ni sub(3)TeO sub(6)-type structure with the polar R3 space group and cell parameters a= 5.3419 (5) Aa and c= 14.0603 (2) Aa. Below T sub(...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2015-11, Vol.44 (47), p.20441-20448
Main Authors: Solana-Madruga, E, Dos santos-Garcia, AJ, Arevalo-Lopez, A M, Avila-Brande, D, Ritter, C, Attfield, J P, Saez-Puche, R
Format: Article
Language:English
Subjects:
Antiferromagnetism
Cations
Disorders
Magnetization
Manganese
Neutron diffraction
Perovskites
Synthesis
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Summary:Two new cation-ordered polymorphs of Mn sub(2)ScSbO sub(6) have been synthesised at high-pressure. At 5.5 GPa and 1523 K Mn sub(2)ScSbO sub(6) crystallizes in the Ni sub(3)TeO sub(6)-type structure with the polar R3 space group and cell parameters a= 5.3419 (5) Aa and c= 14.0603 (2) Aa. Below T sub(C) = 42.0 K it exhibits ferrimagnetic order with a net magnetization of 0.6 mu sub(B) 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 P2 sub(1)/n monoclinic space group with cell parameters a= 5.2909 (3) Aa, b= 5.4698 (3) Aa, c= 7.7349 (5) Aa and beta = 90.165 (6) degree . Magnetization and neutron diffraction experiments reveal antiferromagnetic order below T sub(N) = 22.3 K with the spins lying in the ac plane.
ISSN:1477-9226
1477-9234
DOI:10.1039/c5dt03445k