2015年2月1日 · X-ray absorption spectroscopy (XAS) is on the other hand a powerful method for identifying the electronic structures of iron oxides because of the orbital symmetry selectivity. In the absorption process, photons at specific energies excite a core electron to an empty state above the Fermi level.

2021年11月18日 · Here, comprehensive first-principles calculations of X-ray absorption near-edge structure (XANES) spectra of a series of Fe-based catalysts and battery electrodes, including FeO, Fe 2 O 3, Fe (OH) 2, FeOOH, FeAl 2 O 4, and MFeO 2 (M = Li, Na, or K), were performed to shed light on the issue by dissecting the dependence of XANES line shapes on de...

Fe3O4 nanoparticles (NPs) with an average size of 8–10 nm and a loading ratio of 50 wt% have been successfully attached onto the external surfaces of multi-walled carbon nanotubes (MWNTs) by ...

本文报道了一种在大电流下能稳定工作的Co9S8@Fe3O4异质结构纳米片阵列催化剂，并且利用准原位XAS和原位Raman确定了Co9S8@Fe3O4的结构演变过程。 进一步的研究表明惰性的Fe3O4组分扮演“栅栏”的角色，不仅阻止了OER反应中CoOOH的团聚，而且通过界面相互作用调控 …

Fe K 边 X 射线吸收近边光谱 (XANES) 光谱的研究 3 氧 4 (Fe2O3.Fe 2 氧 3) 天然来源与铁相比 3 氧 4 提出了标准。 天然铁 3 氧 4 以加里曼丹南丹那劳特的铁矿石为原料，采用共沉淀法制备粉末。 透射模式下的 XANES 测量是在泰国呵叻同步加速器光研究所 (SLRI) 进行的。 XRD 物相分析证实合成的 Fe 3 氧 4 粉末为单相，但无法测定Fe的比例 2 氧 3 结构中还有FeO。 TEM 测量证实了天然 Fe 的粒径 3 氧 4 约10纳米。 对边缘前 XANES 数据的定性分析表明，XAS 测量中的吸 …

2015年2月1日 · 这两个光谱是已发表的磁铁矿 Fe L23 光谱范围的典型代表。X 射线衍射证实生物源材料是化学计量的 Fe3O4，并表明原样或部分还原的非生物材料是一种非化学计量氧化物，介于磁铁矿和磁赤铁矿 (γ-Fe2O3) 之间。

We present an investigation on the structural and magnetic properties of the interfaces of Fe3O4/MgO(001) and Fe3O4/NiO/MgO(001) by extracting cation-selective magnetooptical depth profiles by...

2011年9月1日 · In situ x-ray absorption spectroscopy (XAS) measurements were made on Fe3O4 nanoparticles in supercritical aqueous fluids to 500 °C in order to study their reactivity with Co2+ aqua ions and to investigate the structural properties of the reacted nanoparticles.

Fe3O4 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. there are two inequivalent Fe+2.67+ sites. In the first Fe+2.67+ site, Fe+2.67+ is bonded in a 6-coordinate geometry to six O2- atoms. There are two shorter (2.13 Å) and four longer (2.29 Å) Fe–O bond lengths.

The Verwey transition in magnetite (Fe3O4) is the prototypical metal-insulator transition and has eluded a comprehensive explanation for decades.