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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >Sr_2Mn_2O_4Se: A new oxychalcogenide with antiferromagnetic chains
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Sr_2Mn_2O_4Se: A new oxychalcogenide with antiferromagnetic chains

机译：Sr_2Mn_2O_4Se：一种新型的具有反铁磁链的硫代硫属元素

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摘要

The synthesis, crystal structure and magnetic properties of the brown oxide selenide Sr_2Mn_2O_4Se are described. The compound crystallises in space group Pnma with room temperature lattice parameters a = 9.4825(1), b = 10.3356(1) and c = 6.23895(8) ?. The structure contains Mn~(3+) ions in highly distended MnO _4Se_2 octahedra with selenide ions in the axial positions. These octahedra share two of their faces with neighbouring octahedra with the result that all the manganese and oxide ions are involved in the formation of undulating 1~∞[MnO_(4/2)]~- chains directed along the a axis, which form corrugated chains along the c axis by sharing the selenide vertices of the octahedra. These chains are isolated from one another along the b axis. Magnetic susceptibility measurements show that the compound does not obey the Curie-Weiss law below room temperature and there is a magnetic transition at 160(5) K associated with antiferromagnetic ordering of the Mn ~(3+) moments. The magnetic structure measured at 5 K is described by a k = (0, 0, 0) propagation vector and nearest neighbour moments are coupled antiferromagnetically.
机译：描述了氧化棕色硒化物Sr_2Mn_2O_4Se的合成，晶体结构和磁性。该化合物在具有室温晶格参数a ＝ 9.4825（1），b ＝ 10.3356（1）和c ＝ 6.23895（8）δ的空间群Pnma中结晶。该结构在高度扩展的MnO _4Se_2八面体中包含Mn〜（3+）离子，在轴向位置带有硒离子。这些八面体与相邻的八面体共享两个面，其结果是所有的锰和氧化物离子都参与了沿a轴方向成波浪状的1〜∞[MnO_（4/2）]〜-链的形成，形成波纹状通过共享八面体的硒化物顶点沿c轴链接。这些链沿b轴彼此隔离。磁化率测量表明，该化合物在室温以下不遵守居里-魏斯定律，并且在160（5）K处存在与Mn〜（3+）矩的反铁磁有序相关的磁跃迁。用k =（0，0，0）传播矢量描述在5 K下测得的磁结构，并且最近的相邻矩反铁磁耦合。

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