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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Microwave synthesis, structure, and magnetic properties of quasi-one-dimensional complex oxide Sr_4LiMn_2O_9
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Microwave synthesis, structure, and magnetic properties of quasi-one-dimensional complex oxide Sr_4LiMn_2O_9

机译：一维复合氧化物Sr_4LiMn_2O_9的微波合成，结构及磁性能

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摘要

The complex oxide Sr_LiMn_2O_9 belonging to the A_(3n+3m)A'_nMn_(3m+n)O_(9m+6n) family (m = 3, n = 1) was prepared from a mixture of SrCO_3 and LiMn_2O_4 in a microwave furnace by the solid state reaction. The results of structural refinements and magnetic properties are presented. The crystal structure of Sr_4LiMn_2O_9 was solved using simultaneously X-ray and neutron diffraction data with the GSAS program in the space group P321 with unit cell parameters: a = 9.5721(7)A, c = 7.8264(5)A, V=621.025A~3, Z=3. Sr_4LiMn_2O_9 was found to contain 2 independent 1D chains of face-shared polyhedrons with a sequence of two octahedrons and one trigonal prism. The chains are separated by strontium cations. The refinement results show that the octahedrons and trigonal prisms in the first chain orderly contain Mn and Li, respectively, whereas the second chain is characterized by mixed occupation of these structural positions. The temperature dependence of the magnetic susceptibility of Sr_4LiMn_2O_9 was found to be due to antiferromagnetically coupled dimers from magnetic Mn cations.
机译：在微波炉中由SrCO_3和LiMn_2O_4的混合物制备属于A_（3n + 3m）A'_nMn_（3m + n）O_（9m + 6n）族（m = 3，n = 1）的复合氧化物Sr_LiMn_2O_9通过固态反应。给出了结构改进和磁性能的结果。在空间组P321中使用GSAS程序同时使用X射线和中子衍射数据解析Sr_4LiMn_2O_9的晶体结构，其晶胞参数为：a = 9.5721（7）A，c = 7.8264（5）A，V = 621.025A 〜3，Z = 3。发现Sr_4LiMn_2O_9包含2条面共享多面体的2条独立1D链，具有2个八面体和1个三棱柱的序列。链被锶阳离子分开。细化结果表明，第一条链中的八面体和三棱柱分别有序地含有Mn和Li，而第二条链的特征是这些结构位置的混合占据。发现Sr_4LiMn_2O_9的磁化率与温度的关系是由于来自磁性Mn阳离子的反铁磁耦合二聚体引起的。

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