X-ray absorption spectroscopic studies on layered FeWO4Cl and its lithium intercalate

被引：2

作者：

Choy, JH

Yoon, JB

Park, NG

Kim, YI

Han, KS

机构：

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1997年 / 36卷 / 9A期

关键词：

intercalation; FeWO4Cl; EXAFS; XANES; covalency;

D O I：

10.1143/JJAP.36.5605

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Lithium intercalation into FeWO4Cl leads to the structural phase transformation from tetragonal to monoclinic. According to Fe K-edge X-ray absorption near edge structure (XANES) spectroscopic analysis, only the Fe3+ ion in the FeWO4Cl lattice is reduced to Fe2+ with an increment of site symmetry from C-4v to O-h upon lithium intercalation. On the other hand, the white line intensity at the W L-edge XANES becomes slightly enhanced after intercalation, indicating an increase of the (W6+-O) bond covalency due to a decrease of the competing (Fe2+-O) bond strength. W L-3-edge extended X-ray absorption fine structure (EXAFS) analyses for FeWO4Cl and LiFeWO4Cl show that the regular tetrahedron the WO42- group in FeWO4Cl becomes distorted upon lithium intercalation.

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页码：5605 / 5609

页数：5

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