Double double cation order in the high pressure perovskites MnRMnSbO6
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2016
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Wiley
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E. Solana-Madruga, A. M. Arévalo-López, A. J. Dos santos-García, E. Urones, D. Ávila-Brande, R. Sáez-Puche, J. P. Attfield. Double double cation order in the high pressure perovskites MnRMnSbO6. Angew. Chem.: Int. Ed. 2016, 55, 9340-9344. doi: 10.1002/anie.201603526.
Abstract
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.