K4Fe3F12: An Fe2+/Fe3+ Charge-Ordered, Ferrimagnetic Fluoride with a Cation-Deficient, Layered Perovskite Structure
K4Fe3F12: An Fe2+/Fe3+ Charge-Ordered, Ferrimagnetic Fluoride with a Cation-Deficient, Layered Perovskite Structure
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DOI：
10.1021/acs.inorgchem.5b01006
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发表时间：
2015-07-06
影响因子：
4.6
通讯作者：
Hayward, Michael A.
中科院分区：
文献类型：
--
作者：
Kim, Sun Woo;Zhang, Ronghuan;Hayward, Michael A.
合成并表征了一种新型的具有层状钙钛矿结构的混合价铁（Fe 2 +/Fe 3+）氟化物材料。采用温和的水热条件合成了K4 Fe 3F 12 [K-4（Fe 2+）-（Fe 3+）（2）F-12]。该材料表现出层状钙钛矿结构，由顶点连接的Fe 2 +F6和Fe 3 +F6八面体的交替片组成;因此，每层Fe 2 +F6中心夹在两层Fe 3 +F6中心之间。磁化和中子粉末衍射数据表明，在冷却到120 K以下时，K4 Fe 3F 12采用磁有序状态，其中Fe 3+和Fe 2+自旋以近似反平行的方式彼此对齐，以产生赝铁磁结构，在10 K下每个分子式单元的净自发磁矩为5.41 μ B。晶体数据：K_4Fe_3F_（12），三方晶系空间群R（3），在酵母（No.166）上，a = B = 5.7649（9）埃，c = 28.086（9）埃，V= 808.36（3）埃，Z = 3，T = 296（2）K.
A new mixed-valence iron (Fe2+/Fe3+) fluoride material with a layered perovskite-related structure has been synthesized and characterized. The material, K4Fe3F12 [K-4(Fe2+)-(Fe3+)(2)F-12], was synthesized using mild hydrothermal conditions. The material exhibits a layered perovskite structure consisting of alternating sheets of apex-linked Fe2+F6 and Fe3+F6 octahedra; thus, each layer of Fe2+F6 centers is sandwiched between two layers of Fe3+F6 centers. Magnetization and neutron powder diffraction data show that, upon cooling below 120 K, K4Fe3F12 adopts a magnetically ordered state in which the Fe3+ and Fe2+ spins are aligned in an approximately antiparallel manner to each other to yield a pseudoferrimagnetic structure with a net spontaneous moment of 5.41 mu B per formula unit at 10 K. Crystal data: K4Fe3F12, trigonal space group R (3) over barm (No. 166), a = b = 5.7649(9) angstrom, c = 28.086(9) angstrom, V= 808.36(3) angstrom(3), Z = 3, T = 296(2) K.