Sr 2 Mn 2 O 4 Se: A New Oxychalcogenide with Antiferromagnetic Chains
Sr 2 Mn 2 O 4 Se: A New Oxychalcogenide with Antiferromagnetic Chains
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Sr 2 Mn 2 O 4 Se：一种具有反铁磁链的新型硫族化物
DOI：
10.1002/zaac.201200254
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发表时间：
2012
期刊：
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通讯作者：
Free D
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作者：
Free D
描述了棕色氧化硒化物Sr2Mn2O4Se的合成、晶体结构和磁性能。该化合物在空间群 Pnma 中结晶，室温晶格参数 a= 9.4825 (1)、b= 10.3356 (1) 和 c= 6.23895 (8) Å。该结构在高度膨胀的 MnO4Se2 八面体中含有 Mn3+ 离子，硒化物离子位于轴向位置。这些八面体与相邻的八面体共享两个面，因此所有锰离子和氧化物离子都参与形成沿 a 轴定向的波动 \rm^1_∞ MnO4/2 链，这些链通过共享八面体的硒化物顶点而沿 c 轴形成波纹链。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-韦斯定律，并且在 160 (5) K 时存在与 Mn3+ 矩的反铁磁有序相关的磁转变。在 5 K 下测量的磁结构由 ak=(0, 0, 0) 传播矢量描述，最近邻矩以反铁磁方式耦合。
The synthesis, crystal structure and magnetic properties of the brown oxide selenide Sr2Mn2O4Se 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) Å. The structure contains Mn3+ ions in highly distended MnO4Se2 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 \rm^1_∞ MnO4/2–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 Mn3+ moments. The magnetic structure measured at 5 K is described by ak=(0, 0, 0) propagation vector and nearest neighbour moments are coupled antiferromagnetically.