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Article Dans Une Revue Inorganic Chemistry Année : 2020

Magnetic Structures of Mn 11 Ta 4 O 21 and Interpretation as an Hexagonal A-site Manganite

Résumé

Mn11Ta4O21 is presented as the first Hexagonal A-site Manganite. Based on simple rules, the structure is compatible with a 14Hlayer (cchchch)2 stacking sequence; related to BaVO3 and BaCrO3 high pressure polymorphs. The A-site over-stoichiometry is explained through difference in ionic radii sizes between Ba and Mn. Magnetic properties show two transitions at TN1 = 88 K and TN2 = 56 K. Neutron powder diffraction evidence two magnetic structures with purely antiferromagnetic and ferrimagnetic orders below TN1 and TN2 respectively. A complementary description with 14H-(hhccccc)2 sequence of only Mn octahedra provides a direct comparison with BaMnO3-δ hexagonal perovskites and naturally explains the AFM order. Below TN2 a magneto-elastic coupling along with uniaxial negative thermal expansion are observed.
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hal-03088341 , version 1 (05-01-2021)

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Cintli Aguilar-Maldonado, Eugenia Arévalo-López, Clemens Ritter, Olivier Mentré, Angel Arévalo-López. Magnetic Structures of Mn 11 Ta 4 O 21 and Interpretation as an Hexagonal A-site Manganite. Inorganic Chemistry, 2020, 59 (18), pp.13128-13135. ⟨10.1021/acs.inorgchem.0c01387⟩. ⟨hal-03088341⟩
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