X-ray photoelectron study of temperature effect on the valence state of Mn in single crystal YMnO3

被引：28

作者：

Kochur, A. G. ^{[1
]}

Kozakov, A. T. ^{[2
]}

Googlev, K. A. ^{[2
]}

Nikolskii, A. V. ^{[2
]}

机构：

[1] Rostov State Transport Univ, Rostov Na Donu 344038, Russia

[2] Southern Fed Univ, Sci Res Inst Phys, Rostov Na Donu 344194, Russia

来源：

JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA | 2014年 / 195卷

关键词：

Yttrium manganite; Temperature effect on Mn ion state; Mn3+/Mn4+ relative content from XPES; ELECTRONIC-STRUCTURE; SPECTROSCOPY DATA; IONS; BI; DIFFRACTION; MANGANITES; SPECTRA; CHARGE; XPS; EU;

D O I：

10.1016/j.elspec.2014.04.007

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Temperature effect on the valence state of Mn in single crystal YMnO3 is studied using Y3d-, Mn2p-, and O1s-spectra. Mn2p- spectra of Mn3+ and Mn4+ ions at various temperatures are calculated in an isolated ion approximation. Original crystal at room temperature was found to contain only Mn3+ ions, whereas after the temperature treatment (heating in vacuum up to 593 K, cooling down back to room temperature and consecutive heating to a given temperature), Mn4+ ions were detected in the crystal. Relative Mn4+/Mn3+ abundances at various final temperatures are determined by fitting the experimental Mn2p spectra with the superposition of theoretical spectra from Mn3+ and Mn4+ ions, and from relative intensities of O1s-spectrum components. Concentration of Mn4+ ions correlates with the distortion of the crystal structure reflected in overstoichiometry of manganese and understoichiometry of oxygen. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：1 / 7

页数：7

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