Study of electron transition energies between anions and cations in spinel ferrites using differential UV-vis absorption spectra

被引：10

作者：

Xue, L. C. ^{[1
]}

Wu, L. Q. ^{[1
]}

Li, S. Q. ^{[1
,2
]}

Li, Z. Z. ^{[1
]}

Tang, G. D. ^{[1
]}

Qi, W. H. ^{[1
]}

Ge, X. S. ^{[1
]}

Ding, L. L. ^{[1
]}

机构：

[1] Hebei Normal Univ, Dept Phys, Hebei Adv Thin Film Lab, Shijiazhuang 050024, Peoples R China

[2] Hebei Univ Sci & Technol, Sch Sci, Shijiazhuang 050018, Peoples R China

来源：

PHYSICA B-CONDENSED MATTER | 2016年 / 492卷

基金：

中国国家自然科学基金;

关键词：

Spinel ferrite; Crystal structure; UV-vis absorption spectra; Electron transition energy; MAGNETIC-MOMENT DIRECTIONS; OPTICAL BAND-GAP; TRANSPORT; COMPLEXES; FE(III);

D O I：

10.1016/j.physb.2016.04.002

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

It is very important to determine electron transition energies (E-tr) between anions and different cations in order to understand the electrical transport and magnetic properties of a material. Many authors have analyzed UV-vis absorption spectra using the curve (alpha hv)(2) vs E, where alpha is the absorption coefficient and E(=hv) is the photon energy. Such an approach can give only two band gap energies for spinel ferrites. In this paper, using differential UV-vis absorption spectra, d alpha/dE vs E, we have obtained electron transition energies (E-tr) between the anions and cations, Fe2+ and Fe3+ at the (A) and [B] sites and Ni2+ at the [B] sites for the (A)[B](2)O-4 spinel ferrite samples CoxNi0.7-xFe2.3O4 (0.0 < x < 0.3), CoxNi0.7Fe2.3-xO4 (0.0 <= x <= 0.3) and Fe3O4. We suggest that the differential UV-vis absorption spectra should be accepted as a general analysis method for determining electron transition energies between anions and cations. (C) 2016 Elsevier B.V. All rights reserved.

引用

页码：61 / 64

页数：4

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