K4Fe3F12: An Fe2+/Fe3+ Charge-Ordered, Ferrimagnetic Fluoride with a Cation-Deficient, Layered Perovskite Structure
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- 作者：Sun Woo Kim ; Ronghuan Zhang ; P. Shiv Halasyamani ; Michael A. Hayward
- 刊名：Inorganic Chemistry
- 出版年：2015
- 出版时间：July 6, 2015
- 年：2015
- 卷：54
- 期：13
- 页码：6647-6652
- 全文大小：330K
- ISSN：1520-510X
文摘
A new mixed-valence iron (Fe2+/Fe3+) fluoride material with a layered perovskite-related structure has been synthesized and characterized. The material, K4Fe3F12 [K4(Fe2+)(Fe3+)2F12], 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 渭B per formula unit at 10 K. Crystal data: K4Fe3F12, trigonal space group R3虆m (No. 166), a = b = 5.7649(9) 脜, c = 28.086(9) 脜, V = 808.36(3) 脜3, Z = 3, T = 296(2) K.