Surface structure of α-Fe2O3 nanocrystal observed by OK-edge X-ray absorption spectroscopy

被引：20

作者：

Zhang, J ^{[1
]}

Wu, ZY ^{[1
]}

Ibrahim, K ^{[1
]}

Abbas, MI ^{[1
]}

Ju, X ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, Beijing Synchrotron Radiat Lab, Beijing 100039, Peoples R China

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 2003年 / 199卷

关键词：

OK-edge XANES; surface structure; alpha-Fe2O3; nanocrystal;

D O I：

10.1016/S0168-583X(02)01576-8

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

X-ray absorption near edge structure (XANES) spectra is used as a probe of surface structure of alpha-Fe2O3 nanocrystal, prepared by sol-gel method. We present O K-edge XANES of alpha-Fe2O3 in nanocrystal and bulk by total electron yield at the photoemission station of Beijing Synchrotron Radiation Facility. The spectrum of alpha-Fe2O3 shows a splitting of the pre-edge structure, which is interpreted as two subsets of Fe 3d t(2g) and e(g) orbitals in oxygen octahedral (O-h) crystal field, and is also sensitive to long-range order effects. However, no distinguishable splitting of the pre-edge peak of nanocrystal alpha-Fe2O3 is observed. This suggests that there exists the distorted octahedral coordination around Fe sites and also the long-range disorder due to the surface as compared with bulk alpha-Fe2O3. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：291 / 294

页数：4

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