Double Double Cation Order in the High-Pressure Perovskites MnRMnSbO6

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• 作者：Elena Solana-Madruga ; Dr. Á ; ngel M. Aré ; valo-Ló ; pez ; Dr. Antonio J. Dos Santos-Garc&#237 ; a ; Dr. Esteban Urones-Garrote ; Dr. David Á ; vila-Brande ; Prof. Regino Sá ; ez-Puche and Prof. J. Paul Attfield
• 刊名：Angewandte Chemie International Edition
• 出版年：2016
• 出版时间：August 1, 2016
• 年：2016
• 卷：55
• 期：32
• 页码：9340-9344
• 全文大小：2903K
• ISSN：1521-3773

文摘

Cation ordering in ABO<sub>3sub> perovskites adds to their chemical variety and can lead to properties such as ferrimagnetism and magnetoresistance in Sr<sub>2sub>FeMoO<sub>6sub>. Through high-pressure and high-temperature synthesis, a new type of “double double perovskite” structure has been discovered in the family MnRMnSbO<sub>6sub> (R=La, Pr, Nd, Sm). This tetragonal structure has a 1:1 order of cations on both A and B sites, with A-site Mn<sup>2+sup> and R<sup>3+sup> cations ordered in columns and Mn<sup>2+sup> and Sb<sup>5+sup> having rock salt order on the B sites. The MnRMnSbO<sub>6sub> double double perovskites are ferrimagnetic at low temperatures with additional spin-reorientation transitions. The ordering direction of ferrimagnetic Mn spins in MnNdMnSbO<sub>6sub> changes from parallel to [001] below T<sub>Csub>=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)MnSbO<sub>6sub> for Eu and Gd.