Photoelectron spectra and surface valence fluctuation of Eu in the misfit-layer compound {(EuS)1.15}1.5NbS2

被引：19

作者：

Ohno, Y ^{[1
]}

Urata, T ^{[1
]}

机构：

[1] Utsunomiya Univ, Fac Engn, Dept Elect & Elect Engn, Utsunomiya, Tochigi 3218585, Japan

来源：

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA | 2002年 / 125卷 / 03期

关键词：

X-ray photoelectron spectra; valence fluctuation; Eu misfit-layer compounds;

D O I：

10.1016/S0368-2048(02)00163-9

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

The 1.5Q/1 H type of the misfit layer compound {(EuS)(1.5)}(1.5)NbS2 has been studied by X-ray photoelectron spectroscopy. Eu 3d, 4d, 4f and 5p spectra are measured with Al and MgKalpha radiation. Their intensities are analyzed, taking the escape depth of photoelectrons emitted from the core levels into account. The results indicate that valence transfer of nearly-half Eu2+ ions to Eu3+ happens in the outermost surface layer and a reduced Eu-S distance brings about surface rearrangement. It is confirmed that Eu2+ and Eu3+ coexist in a bulk, in consistency with bond valence calculations and Mossbauer spectra. The XPS spectra are well interpreted in terms of the multiplet structures of Eu2+ and Eu3+. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：171 / 180

页数：10

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