Valence control of charge and orbital frustrated system YbFe2O4 with electrochemical Li+ intercalation
Valence control of charge and orbital frustrated system YbFe2O4 with electrochemical Li+ intercalation
复制标题
电化学嵌锂的电荷和轨道受挫体系 YbFe2O4 的价态控制
DOI：
10.1016/j.jpcs.2021.110468
复制
发表时间：
2022
影响因子：
4
通讯作者：
Ikeda N.
中科院分区：
文献类型：
--
作者：
Murase S.;Yoshikawa Y.;Fujiwara K.;Fukada Y.;Teranishi T.;Kano J.;Fujii T.;Inada Y.;Katayama M.;Yoshii K.;Tsuji T.;Matsumura D.;Ikeda N.
为了开发一种有效的技术来控制强相关电子系统中电荷的挫败，我们报道了一种混合价三角形氧化铁ybfe2o4的价控制试验。在类似锂离子二次电池的电池型样品上，研究了Li+在ybfe2o4中的电化学掺杂。在Li掺杂的情况下，晶格常数、Fe-Fe和Fe-Yb距离发生了系统的变化。掺杂的最大值超过300 mAh/g。EXAFS实验表明，Li位于Yb八面体层（u层）和fe双锥体层（w层）之间。然而，由于XANES观测中金属铁纳米颗粒信号的叠加，ybfe2o4的铁价态的详细变化并没有被清楚地观察到。我们讨论了不确定性可能来自于样品粒度的不均匀分布，这可能会阻止Li的均匀掺杂，因为掺杂发生在每个纳米颗粒的表面。
We report a trial of the valence control for mixed valence iron triangular oxide YbFe2O4in order to develop an effective technique to control the frustration of charges in strongly correlated electron systems. The electro-chemical doping of Li+into YbFe2O4was examined on the cell type sample similar to the Li-ion secondary battery cell. Systematic change of the lattice constant, Fe–Fe and Fe–Yb distance were observed with Li doping. Maximum value of the doping was over 300 mAh/g. An EXAFS experiment indicated that Li positioned between Yb octahedron layer (U-layer) and Fe-bipyramidal layer (W-layer). However, detailed change of iron valence state of YbFe2O4was not clearly observed because of the superimpose of the signal from iron metal nano particles in XANES observation. We discuss that the uncertainty might arise from the inhomogeneous distribution of the sample particle size, which might prevent the homogeneous doping of Li because the doping occurs on the surface of each nano-particles.