Double perovskite generally exhibits small structure distortion induced by the expansion/contraction and tilting of the BO_(6)octahedron.It is difficult to precisely determine their structures,particularly the phase w...Double perovskite generally exhibits small structure distortion induced by the expansion/contraction and tilting of the BO_(6)octahedron.It is difficult to precisely determine their structures,particularly the phase with notable pseudo-symmetry structure and two or more phases with slightly different structures.In this paper,the double perovskite Y_(2)CrMnO_(6)synthesized under high pressure was studied using scanning transmission electron microscopy and first-principles calculations.The new finding is that a rock-salt ordered structure and a layer ordered structure coexist in Y_(2)CrMnO_(6).Similar to the Cu^(2+)-based compound,this Mn^(3+)-based compound is another new system with layer ordered structure.Unlike the structures of YCrO_(3)and YMnO_(3),the ordered structure of Y_(2)CrMnO_(6)displays half-metal characteristics.展开更多
基金supported by the National key research program of China(Grant No.2016YFA0300701,2017YFA0206200)the National Natural Science Foundation of China(Grant No.11174336,11374343).
文摘Double perovskite generally exhibits small structure distortion induced by the expansion/contraction and tilting of the BO_(6)octahedron.It is difficult to precisely determine their structures,particularly the phase with notable pseudo-symmetry structure and two or more phases with slightly different structures.In this paper,the double perovskite Y_(2)CrMnO_(6)synthesized under high pressure was studied using scanning transmission electron microscopy and first-principles calculations.The new finding is that a rock-salt ordered structure and a layer ordered structure coexist in Y_(2)CrMnO_(6).Similar to the Cu^(2+)-based compound,this Mn^(3+)-based compound is another new system with layer ordered structure.Unlike the structures of YCrO_(3)and YMnO_(3),the ordered structure of Y_(2)CrMnO_(6)displays half-metal characteristics.
