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Article Dans Une Revue Angewandte Chemie International Edition Année : 2016

Double Double Cation Order in the High-Pressure Perovskites MnRMnSbO6

Résumé

Cation ordering in ABO3 perovskites adds to their chemical variety and can lead to properties such as ferrimagnetism and magnetoresistance in Sr2FeMoO6. Through high-pressure and high-temperature synthesis, a new type of “double double perovskite” structure has been discovered in the family MnRMnSbO6 (R=La, Pr, Nd, Sm). This tetragonal structure has a 1:1 order of cations on both A and B sites, with A-site Mn2+ and R3+ cations ordered in columns and Mn2+ and Sb5+ having rock salt order on the B sites. The MnRMnSbO6 double double perovskites are ferrimagnetic at low temperatures with additional spin-reorientation transitions. The ordering direction of ferrimagnetic Mn spins in MnNdMnSbO6 changes from parallel to [001] below TC=76 K to perpendicular below the reorientation transition at 42 K at which Nd moments also order. Smaller rare earths lead to conventional monoclinic double perovskites (MnR)MnSbO6 for Eu and Gd.

Dates et versions

hal-04552628 , version 1 (19-04-2024)

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Citer

Elena Solana Madruga, Angel Arevalo Lopez, Antonio J. dos Santos-Garcia, Esteban Urones-Garrote, David Avila-Brande, et al.. Double Double Cation Order in the High-Pressure Perovskites MnRMnSbO6. Angewandte Chemie International Edition, 2016, Angewandte Chemie International Edition, 55, pp.9340-9344. ⟨10.1002/anie.201603526⟩. ⟨hal-04552628⟩
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