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Issue 44, 2018
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Effect of the degree of inversion on optical properties of spinel ZnFe2O4

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Abstract

Spinel ferrites (T[M1−xFex]O[MxFe2−x]O4 with 0 ≤ x ≤ 1, where M is a bivalent metal ion and the superscripts denote tetrahedral and octahedral sites) are materials commonly used in electronics due to their outstanding magnetic properties. Thus, the effect of the degree of inversion, x, on these properties is well known. However, its effect on other properties of these materials has rarely been investigated in detail. Since ferrites gained much attention during the last decade as visible light active photocatalysts and photoelectrocatalysts, understanding the effect of the degree of inversion on the optical properties became necessary. Among photocatalytically and photoelectrocatalytically active spinel ferrites, zinc ferrite (ZnFe2O4, ZFO) is one of the most widely studied materials. In this work, five ZFO samples with degrees of inversion varying from 0.07 to 0.20 were prepared by a solid-state reaction employing different annealing temperatures and subsequent quenching. Raman and UV-Vis-NIR spectra were measured and analyzed together with theoretical results obtained from ab initio calculations. Changes in the UV-Vis-NIR spectra associated with electronic transitions of tetrahedrally and octahedrally coordinated Fe3+ ions are distinguished. However, the optical band gap of the material remains unchanged as the degree of inversion varies. Based on the experimental and theoretical results, a new assignment for the Raman active internal modes and the electronic transitions of ZFO is proposed.

Graphical abstract: Effect of the degree of inversion on optical properties of spinel ZnFe2O4

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Publication details

The article was received on 08 Aug 2018, accepted on 28 Oct 2018 and first published on 29 Oct 2018


Article type: Paper
DOI: 10.1039/C8CP05061A
Citation: Phys. Chem. Chem. Phys., 2018,20, 28267-28278
  • Open access: Creative Commons BY-NC license
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    Effect of the degree of inversion on optical properties of spinel ZnFe2O4

    L. I. Granone, A. C. Ulpe, L. Robben, S. Klimke, M. Jahns, F. Renz, T. M. Gesing, T. Bredow, R. Dillert and D. W. Bahnemann, Phys. Chem. Chem. Phys., 2018, 20, 28267
    DOI: 10.1039/C8CP05061A

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