Related Experiment Video
Updated: Jun 19, 2026
Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
Published on: October 27, 2018
Fe5O5[B6O10(OH)3] x nH2O: wave-layered iron borate and frustrated antiferromagnetism
Tao Yang1, Junliang Sun, Guobao Li
1Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, PR China.
Abstract:
The first layered iron borate, Fe(5)O(5)[B(6)O(10)(OH)(3)] x nH(2)O, has been prepared by the boric acid flux method. Its structure, determined by single crystal X-ray diffraction, contains a double FeO(6)-octahedral layer and an unusual [B(6)O(13)] chain. The rigid and cambered [B(6)O(13)] chains bend the octahedral layers, resulting in a wave-like and sandwiched structure. Crystallographic study indicates the structural modulation is mainly from the [B(6)O(13)] chains because of the insertion of water molecules in between. Nevertheless, FeO(6) 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 Fe(3+)-net suggest a possible geometrically magnetic frustration, which may be the reason for the second-order temperature-induced magnetic transition at approximately 125 K. The condensed Fe(3+) layers and the relatively low redox potential at about 1.25 V versus Li(+)/Li show its potentials as an anodic material.
Related Concept Videos
01:31Ferromagnetism
02:42Valence Bond Theory
03:02Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
02:42Ionic Crystal Structures
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
02:54Lewis Structures of Molecular Compounds and Polyatomic Ions
02:58Crystal Field Theory - Octahedral Complexes
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...