Fe5O5[B6O10(OH)3]·nH2O: Wave-Layered Iron Borate and Frustrated Antiferromagnetism

详细信息    查看全文

• 作者：Tao Yang ; Junliang Sun ; Guobao Li ; Yingxia Wang ; Jeppe Christensen ; Zhanbing He ; Kirsten E. Christensen ; Xiaodong Zou ; Fuhui Liao ; Jianhua Lin
• 刊名：Inorganic Chemistry
• 出版年：2009
• 出版时间：December 7, 2009
• 年：2009
• 卷：48
• 期：23
• 页码：11209-11214
• 全文大小：922K
• 年卷期：v.48,no.23(December 7, 2009)
• ISSN：1520-510X

文摘

The first layered iron borate, Fe₅O₅[B₆O₁₀(OH)₃]·nH₂O, has been prepared by the boric acid flux method. Its structure, determined by single crystal X-ray diffraction, contains a double FeO₆-octahedral layer and an unusual [B₆O₁₃] chain. The rigid and cambered [B₆O₁₃] chains bend the octahedral layers, resulting in a wave-like and sandwiched structure. Crystallographic study indicates the structural modulation is mainly from the [B₆O₁₃] chains because of the insertion of water molecules in between. Nevertheless, FeO₆ layers in the average structure, which are well separated by borate chains, is still a reasonable model to understand the two-dimensional magnetism. The strong antiferromagnetic interactions and the complex Fe³⁺-net suggest a possible geometrically magnetic frustration, which may be the reason for the second-order temperature-induced magnetic transition at 125 K. The condensed Fe³⁺ layers and the relatively low redox potential at about 1.25 V versus Li⁺/Li show its potentials as an anodic material.