Chemical bonding and valence state of 3d-metal ions in Ni1-xCoxCr2O4 spinels from X-ray diffraction and X-ray photoelectron spectroscopy data

被引：16

作者：

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

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

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

Mikheykin, A. S. ^{[3
]}

Torgashev, V. I. ^{[3
]}

Bush, A. A. ^{[4
]}

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 344090, Russia

[3] Southern Fed Univ, Fac Phys, Rostov Na Donu 344090, Russia

[4] Moscow State Tech Univ Radio Engn Elect & Automat, Tech Univ, Moscow 119454, Russia

来源：

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

基金：

俄罗斯基础研究基金会;

关键词：

Ni1-xCoxCr2O4; spinels; XPS; X-ray diffraction; Valence state; Crystal structure; XPS SPECTRA; PHOTOEMISSION SPECTRA; HYPERFINE INTERACTION; NICKEL; NICR2O4; TRANSITION; ELECTRON; SYSTEM; NI(II); METAL;

D O I：

10.1016/j.elspec.2014.07.010

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Ni1-xCoxCr2O4 solid solution samples with x=0, 0.005, 0.01, 0.02, 0.3, 0.5, 0.8 and 1 are studied by the methods of X-ray diffraction and X-ray photoelectron spectroscopy (XPS). Ni2p(3/2),(1/2), Co2p(3/2),(1/2), Cr2p(3/2),(1/2), and O1s spectra are measured. The spectra are calculated with allowance for multiplet splitting, crystal field, and charge-transfer effect. Ni2+ ions are found to be present in tetrahedral and octahedral positions. Relative numbers of Ni2+ ions in tetrahedral and octahedral sites are determined via fitting the experimental spectra with superposition of the spectra of Ni2+ ions calculated in tetrahedral and octahedral crystal field. Cobalt ions are bivalent and occupy mostly tetrahedral sites. Chromium ions are trivalent and occupy predominantly octahedral positions. However, due to a defective lattice, the samples may contain Cr ions in non-equivalent states, either chemically or structurally. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：208 / 219

页数：12

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